Keywords: above-belowground biomass; alpine meadows; desert steppes; climate factors; soil nutrients
关键词:地上地下生物量;高山草甸;荒漠草原;气候因素;土壤养分
Grasslands play a crucial role as carbon sinks within terrestrial ecosystems, making a significant contribution to the global carbon cycle [1]. The distribution of plant biomass between aboveground and belowground components reflects the adaptive survival strategies of plants in diverse habitats, developed over extended periods in response to environmental changes and stresses [2]. The distribution of aboveground and belowground biomass in grassland ecosystems is widely discussed, and in general, belowground biomass is higher than aboveground biomass in grassland ecosystems [3,4]. While extensive research has been conducted on aboveground plant biomass [5,6], the allocation of belowground biomass and its controlling factors remain relatively underexplored due to the challenges associated with obtaining belowground biomass data [7]. Investigating the allocation strategies of grassland plants for above- and belowground biomass, along with their governing
草地在陆地生态系统中作为碳汇起着至关重要的作用,对全球碳循环做出了重要贡献[1]。植物生物量在地上部分和地下部分之间的分布反映了植物在不同栖息地中的适应性生存策略,这些策略是在长时间内对环境变化和压力的响应中形成的[2]。草地生态系统中地上部分和地下部分生物量的分布被广泛讨论,一般来说,草地生态系统中地下部分生物量高于地上部分生物量[3,4]。虽然已经对地上植物生物量进行了广泛研究[5,6],但由于获取地下生物量数据的挑战,地下生物量的分配及其控制因素仍然相对未被充分探索[7]。研究草地植物地上和地下生物量的分配策略以及其控制因素,可以推进我们对草地生态系统中碳分配和储存动态的理解[8]。
factors, can advance our understanding of carbon allocation and storage dynamics within grassland ecosystems [8].
因素。
Previous research has established that the allocation of plant biomass between aboveground and belowground components is primarily influenced by climatic and soil nutrient factors [9]. According to the optimal partitioning hypothesis, plants in resource-limited environments adjust their biomass allocation between above- and belowground components to adapt to environmental stresses [10]. The effects of climate change and soil nutrient availability can impact plant investment in belowground components within grassland ecosystems [11-13].
先前的研究已经确定,植物生物量在地上和地下部分之间的分配主要受气候和土壤养分因素的影响[9]。根据最佳分配假说,资源有限的环境中的植物会调整它们在地上和地下部分之间的生物量分配,以适应环境压力[10]。气候变化和土壤养分可用性的影响可能会影响草地生态系统中植物对地下部分的投资[11-13]。
Temperature and precipitation are pivotal climatic factors [14]. Existing studies demonstrate that the interaction between temperature and moisture significantly impacts plant belowground biomass allocation, particularly in arid regions [15]. In arid and semi-arid grasslands, elevated temperatures influence enzyme reaction rates and reduce the photosynthetic capacity of aboveground plant components [16]. Concurrently, higher temperatures accelerate the evaporation of surface water from the soil, diminishing soil moisture availability and, consequently, the plant's ability to access soil nutrients [17]. Consequently, in arid regions, plants allocate more resources to root biomass to secure water and adapt to drought stress [18].
温度和降水是关键的气候因素[14]。现有研究表明,温度和湿度之间的相互作用显著影响植物地下生物量分配,尤其是在干旱地区[15]。在干旱和半干旱草地中,升高的温度影响酶反应速率,降低地上植物组分的光合能力[16]。同时,较高的温度加速了土壤表面水分的蒸发,减少了土壤湿度可用性,从而降低了植物获取土壤养分的能力[17]。因此,在干旱地区,植物将更多的资源分配给根系生物量,以确保水分并适应干旱胁迫[18]。
In addition to environmental factors, grassland productivity also significantly impacts the BGBP [26]. There is a strong positive correlation between aboveground biomass and net primary productivity (NPP), with biomass serving as the primary driver of NPP [27]. Grassland productivity reflects the amount of organic carbon fixed through photosynthesis in aboveground plant parts [28]. Therefore, as the NPP gradually increases in a specific grassland area, it signifies that the vegetation in that area acquires more biomass by increasing the aboveground growth, resulting in a decrease in the BGBP for the vegetation in that area [29].
除了环境因素外,草地生产力也对BGBP [26] 产生显著影响。地上生物量与净初级生产力(NPP)之间存在强烈的正相关关系,生物量是NPP的主要驱动因素 [27]。草地生产力反映了通过光合作用在地上植物部分固定的有机碳的数量 [28]。因此,随着特定草地区域的NPP逐渐增加,意味着该区域的植被通过增加地上生长获得更多的生物量,从而导致该区域植被的BGBP减少 [29]。
Temperature, precipitation, and soil nutrients have the capacity to alter plant biomass allocation strategies [9]. However, there is a scarcity of studies that specifically examine the differences in belowground biomass allocation between desert steppes (DSs) and alpine meadows (AMs) [30]. Owing to variations in geographical location, hydrothermal conditions, and soil nutrient profiles, the distribution of belowground biomass significantly differs between an AM and DS [11-13]. High-elevation grasslands are predominantly found in mountainous and plateau regions, characterized by dry and cold climates, and prolonged snow cover periods. Soil nutrient availability is relatively limited in these high-elevation areas [31], making soil nutrient availability a critical environmental factor influencing plant belowground biomass allocation in these grasslands. Conversely, desert grasslands are primarily situated in arid and semi-arid regions, characterized by low precipitation and high rates of water evaporation [5]. Therefore, climatic factors may be the primary environmental determinants influencing plant belowground biomass allocation in desert grasslands. In essence, the distribution of belowground biomass in grasslands is influenced by climate factors and soil nutrients [9]. Climate factors impact soil nutrients through processes like weathering, leaching, and biological interactions, subsequently influencing belowground biomass allocations in both AMs and DSs through their effects on the soil environment [32,33].
温度、降水和土壤养分具有改变植物生物量分配策略的能力[9]。然而,关于荒漠草原(DSs)和高山草甸(AMs)之间地下生物量分配差异的研究还很少[30]。由于地理位置、水热条件和土壤养分状况的变化,AM和DS之间的地下生物量分布显著不同[11-13]。高海拔草地主要分布在山地和高原地区,其特点是干燥寒冷的气候和长时间的积雪覆盖期。这些高海拔地区土壤养分的可利用性相对有限[31],使得土壤养分的可利用性成为影响这些草地植物地下生物量分配的关键环境因素。相反,沙漠草地主要分布在干旱和半干旱地区,其特点是降水量较低和水分蒸发率较高[5]。因此,气候因素可能是影响沙漠草地植物地下生物量分配的主要环境决定因素。 本质上,草地地下生物量的分布受气候因素和土壤养分的影响[9]。气候因素通过风化、淋溶和生物相互作用等过程影响土壤养分,进而通过对土壤环境的影响,影响AMs和DSs的地下生物量分配[32,33]。
It remains unclear whether significant differences exist in the spatial distribution of the BGBP among various grassland types, and whether the dominant environmental factors and specific ecological processes responsible for the spatial distribution of BGBP are consistent. To address this question, we propose the following hypotheses based on biomass data from 182 plots spanning 17 AMs and 21 DSs in China: (1) substantial variations are observed in the spatial distributions of plant BGBP values across distinct grassland types; (2) climate factors are the primary environmental determinants influencing the BGBP in DSs, while soil nutrient factors play a pivotal role in shaping the BGBP in AMs; and (3) climate factors influence the spatial distribution patterns of BGBP in different grassland types by modulating the availability of soil nutrients.
尚不清楚不同草地类型之间的 BGBP 空间分布是否存在显著差异,以及导致 BGBP 空间分布的主要环境因素和特定生态过程是否一致。为了解决这个问题,我们根据中国 17 个 AM 和 21 个 DS 的 182 个样地的生物量数据,提出以下假设:(1)不同草地类型的植物 BGBP 值的空间分布存在显著变异;(2)气候因素是影响 DS 中 BGBP 的主要环境决定因素,而土壤养分因素在 AM 中塑造 BGBP 起关键作用;(3)气候因素通过调节土壤养分的可利用性,影响不同草地类型的 BGBP 的空间分布模式。
Distinct geographical disparities are evident in the BGBP between the AM and DS, with the AM exhibiting a significantly higher BGBP. This observation aligns with our previous hypothesis and is consistent with the findings from other studies [34]. Different vegetation types exhibit varying responses to climate change [35]. DSs are typically found in arid plain regions, where rainfall serves as the primary limiting factor for plant growth [36]. To adapt to the impact of drought stress on plant growth and development, plants allocate a greater proportion of organic matter to their underground parts [37]. In contrast, the elevated
在 AM 和 DS 之间的 BGBP 存在明显的地理差异,其中 AM 表现出显著较高的 BGBP。这一观察结果与我们之前的假设一致,并与其他研究的发现[34]一致。不同的植被类型对气候变化表现出不同的响应[35]。DS 通常分布在干旱平原地区,降雨是植物生长的主要限制因素[36]。为了适应干旱胁迫对植物生长和发育的影响,植物将有机物的较大比例分配给地下部分[37]。相反,AM 相对于 DS 的较高 BGBP 归因于其分布在寒冷的高海拔地区,不仅气温低,降雨也较少。在这样的环境中,草本植物倾向于增加根系发育的投资,以应对双重环境压力[38]。
BGBP in an AM compared to a DS is attributed to its distribution in cold, high-altitude regions with not only cold temperatures, but also reduced rainfall. In such environments, grass plants tend to increase their investment in root development as a response to the dual environmental stresses [38].
Numerous studies have consistently shown a strong correlation between the BGBP of plants and climate factors, particularly temperature and precipitation [39,40]. In line with the Optimal Allocation Hypothesis [41,42], a temperature increase within a certain range effectively boosts enzyme activity [43]. To capture more light energy and enhance their photosynthetic capacity, plants allocate a greater proportion of organic matter to aboveground structures, consequently reducing the allocation to belowground active processes [44,45]. This results in a significant decrease in BGBP for AMs with rising temperatures. Notably, DSs show reduced sensitivity to temperature changes, indicating that temperature is not the primary limiting factor influencing DS biomass allocation.
众多研究一致表明,植物的地上地下生物量比与气候因素之间存在着强烈的相关性,尤其是温度和降水[39,40]。与最优分配假说[41,42]一致,一定范围内的温度升高能有效促进酶活性[43]。为了捕获更多的光能并增强光合能力,植物将有机物的较大比例分配给地上结构,从而减少了对地下活跃过程的分配[44,45]。这导致随着温度升高,AMs的地上地下生物量比显著降低。值得注意的是,DSs对温度变化的敏感性降低,表明温度不是影响DS生物量分配的主要限制因素。
Both AMs and DSs exhibit a significant decline in BGBP values with increased rainfall, primarily due to the correlation between root size and plant water and nutrient absorption capacity. In water-scarce grasslands, plants respond by increasing both horizontal and vertical root growth to access more water resources [46]. Consequently, they gradually reduce their investment in belowground root construction, leading to a decrease in BGBP [47]. DSs display higher sensitivity to rainfall changes compared to AMs. Plants in arid regions have adapted to limited water resources over time, relying heavily on water efficiency for survival and growth [12]. However, their biomass allocation is more responsive to fluctuations in rainfall patterns, including increases or decreases in precipitation [48]. In contrast, AM plants thrive in relatively humid environments and have a lower absolute water dependency [13].
AMs和DSs在降雨增加时都表现出BGBP值显著下降,主要是由于根系大小与植物吸水和养分吸收能力之间的相关性。在水资源匮乏的草地中,植物通过增加水平和垂直根系生长来获取更多的水资源[46]。因此,它们逐渐减少对地下根系建设的投资,导致BGBP减少[47]。与AMs相比,DSs对降雨变化更敏感。干旱地区的植物经过时间的适应,依赖水分利用效率来生存和生长[12]。然而,它们的生物量分配对降雨模式的波动更为敏感,包括降水量的增加或减少[48]。相反,AM植物在相对湿润的环境中茁壮成长,并且对水的绝对依赖较低[13]。
Soil plays a pivotal role in supplying essential nutrients for plant growth and development, thus exerting a significant impact on plant biomass allocation strategies [12]. The BGBP of AMs exhibited a notable increase with rising soil nitrogen and phosphorus contents. In alpine regions, the lower temperatures limit soil microbial activity, resulting in slower soil organic matter decomposition and organic matter accumulation. Consequently, the higher soil organic matter content in alpine regions reflects, to some extent, a reduced resource utilization capacity [49]. With increased soil nitrogen and phosphorus contents, soil nutrient availability decreases significantly, prompting plants to allocate more resources to root systems for enhanced soil resource acquisition [50]. This increased root biomass allows plants to explore a larger soil volume for nutrient uptake, leading to higher BGBP levels [51].
土壤在为植物生长和发育提供必需营养物方面起着关键作用,因此对植物生物量分配策略产生显著影响[12]。随着土壤氮磷含量的上升,AMs的BGBP显著增加。在高山地区,较低的温度限制了土壤微生物活动,导致土壤有机物分解和有机物积累速度较慢。因此,高山地区较高的土壤有机物含量在一定程度上反映了降低的资源利用能力[49]。随着土壤氮磷含量的增加,土壤养分的可利用性显著降低,促使植物将更多资源分配到根系以增强土壤资源获取[50]。这种增加的根系生物量使植物能够探索更大的土壤体积进行养分吸收,从而导致更高的BGBP水平[51]。
In general, acidic soil tends to exhibit greater soil nutrient availability compared to alkaline soil. Therefore, as soil pH increases (shifting from acidic to alkaline), the stress related to soil resource availability intensifies, resulting in higher BGBP levels [52]. In contrast, DSs display lower sensitivity to soil nutrient changes. Desert plants tend to adopt conservative growth strategies that they maintain even when nutrient availability increases, as water often serves as the more critical limiting factor. This strategy reduces their dependence on and sensitivity to nutrient changes [47]. In contrast, plants in AMs may rely more on soil nutrients due to the need for rapid growth and reproduction within a short growing season, rendering them more sensitive to shifts in the soil nutrient status [21].
一般来说,酸性土壤相对于碱性土壤更容易提供更多的土壤养分。因此,随着土壤pH的增加(从酸性转变为碱性),与土壤资源可用性相关的压力加剧,导致更高的BGBP水平[52]。相反,沙漠植物对土壤养分变化的敏感性较低。沙漠植物倾向于采取保守的生长策略,即使在养分可用性增加时也能保持,因为水通常是更关键的限制因素。这种策略减少了它们对养分变化的依赖和敏感性[47]。相反,AM中的植物可能更依赖土壤养分,因为它们需要在短暂的生长季节内快速生长和繁殖,使它们对土壤养分状况的变化更敏感[21]。
Utilizing the biomass data from 182 plots across 17 alpine meadows (AMs) and 21 desert steppes (DSs) in China, this study examined the influence of climate factors, soil nutrients, and net primary productivity (NPP) on the BGBP across various grassland types. The findings reveal significant spatial distribution differences in BGBP values among the grassland types. Climate-related factors, by modulating soil nutrient availability, emerged as the primary determinants of the BGBP spatial distribution patterns. Consequently, emphasizing the impact of climate change on the allocation of biomass above- and belowground in grasslands is essential for forecasting terrestrial ecosystems' reactions to global climate change. Additionally, investigating the allocation strategies and influential factors on grassland plants' above- and belowground biomass contributes to a deeper understanding of carbon allocation and storage dynamics within grassland ecosystems. This knowledge is crucial for accurately predicting carbon feedback on a regional scale in the future.
利用中国 17 个高山草甸(AMs)和 21 个沙漠草原(DSs)中 182 个样地的生物量数据,本研究考察了气候因子、土壤养分和净初级生产力(NPP)对不同草地类型 BGBP 的影响。研究结果显示,不同草地类型的 BGBP 值在空间分布上存在显著差异。气候相关因素通过调节土壤养分的可利用性,成为 BGBP 空间分布模式的主要决定因素。因此,强调气候变化对草地地上和地下生物量分配的影响对于预测陆地生态系统对全球气候变化的反应至关重要。此外,研究草地植物地上和地下生物量的分配策略和影响因素有助于更深入地了解草地生态系统中的碳分配和储存动态。这些知识对于准确预测未来区域尺度上的碳反馈至关重要。
Most grasslands in China are situated in the arid and semi-arid regions of Northern China and Tibetan Plateau [59]. In this study, we investigated the spatial distribution patterns and influencing factors of BGBP in different grassland types in China (Figure 7A).
中国大部分的草地位于中国北方和青藏高原的干旱和半干旱地区[59]。在本研究中,我们调查了中国不同草地类型中BGBP的空间分布模式和影响因素(图7A)。
To determine whether climate and soil nutrient factors had a direct or indirect impact on BGBP through community characteristics, we created two structural equation models (SEMs) [66]. These SEMs were built using the R package "piecewiseSEM". The models assumed that: (1) climate factors affected soil nutrient factors, and both climate factors and soil nutrient factors together affected BGBP, and (2) climate factors had a direct effect on BGBP.
为了确定气候和土壤营养因子是否通过群落特征对 BGBP 产生直接或间接影响,我们建立了两个结构方程模型(SEMs)[66]。这些 SEMs 是使用 R 包"piecewiseSEM"构建的。模型假设:(1)气候因素影响土壤营养因子,气候因素和土壤营养因子共同影响 BGBP;(2)气候因素对 BGBP 有直接影响。
Author Contributions: J.G.: conceptualization, methodology, and investigation. J.W., X.Z., R.W., M.Y., X.C., C.Z., J.S. and J.G.: formal analysis. J.W.: writing-original draft. J.W., X.Z. and R.W. contribute equally to this work. All authors have read and agreed to the published version of the manuscript.
作者贡献:J.G.:概念化、方法论和调查。J.W.、X.Z.、R.W.、M.Y.、X.C.、C.Z.、J.S.和 J.G.:正式分析。J.W.:撰写原稿。J.W.、X.Z.和 R.W.对本工作的贡献相同。所有作者已阅读并同意发表版本的手稿。
Funding: This work was supported by the Xinjiang Normal University Young Top Talent Project (No. XJNUQB2023-14), Natural Science Foundation of Xinjiang Uygur Autonomous Region (No. 2022D01A213), Fundamental Research Funds for Universities in Xinjiang (No. XJEDU2023P071), National Natural Science Foundation of China (Grant No. 32201543), Innovation and Entrepreneurship Training Program for College Students in 2023 (No. S202310762004), Xinjiang Normal University Landmark Achievements Cultivation Project (No. XJNUBS2301), Xinjiang Graduate Innovation and Entrepreneurship Project and Tianchi Talent Program.
资助:本研究得到新疆师范大学青年顶尖人才项目(编号:XJNUQB2023-14)、新疆维吾尔自治区自然科学基金(编号:2022D01A213)、新疆高校基本科研业务费项目(编号:XJEDU2023P071)、国家自然科学基金(编号:32201543)、2023 年大学生创新创业训练计划(编号:S202310762004)、新疆师范大学标志性成果培育项目(编号:XJNUBS2301)、新疆研究生创新创业项目和天池人才计划的支持。
Data Availability Statement: No new data were created or analyzed in this study. Data sharing is not applicable to this article.
数据可用性声明:本研究未创建或分析新数据。本文不适用于数据共享。
Conflicts of Interest: The authors declare no conflict of interest.
利益冲突:作者声明无利益冲突。
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