Carbon, nitrogen and phosphorus stocks differ among vegetation patch types in a degraded alpine steppe
Carbon, nitrogen and phosphorus stocks differ among vegetation patch types in a degraded alpine steppe
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退化高山草原中不同植被斑块类型的碳、氮和磷储量存在差异
DOI：
10.1007/s11368-018-2191-0
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发表时间：
2018-11
影响因子：
3.6
通讯作者：
Cai Yanjiang
中科院分区：
文献类型：
--
作者：
Yan Yan;Tian Linlin;Du Ziyin;Chang Scott X.;Cai Yanjiang
目的草地退化导致植被斑块类型多样，植物种类适口性不同，潜在地影响生态系统生产力和土壤有机碳（SOC）固定。本研究以青藏高原高寒退化草原为研究对象，研究了不同植被斑块类型的土壤有机碳密度和C/N/P比值的变化。结果与讨论不同斑块类型的土壤C、N、地上部和根系密度存在差异，但土壤C/N无明显差异。不可口的植物物种占主导地位的补丁有较低的SOC密度，较低的土壤和植物N/P比，和更大的植物养分密度比可口的植物物种占主导地位。植被斑块类型强烈影响土壤-植物系统中的养分密度和比例，仅采样可口的植物物种占主导地位的地区可能会高估在生态系统scale.ConclusionsEven斑块水平的植物生物量和养分密度可能会随着退化的增加而增加，可口性和SOC存储在生态系统尺度的减少会损害草地的可持续性，高寒草地退化的收益。因此，在未来的研究中，应考虑植物的适口性，以提高区域SOC储量估计。
PurposeDegradation of grassland creates diverse vegetation patch types with plant species with different palatabilities, potentially affecting ecosystem productivity and soil organic carbon (SOC) sequestration. This study investigated variations in SOC densities and carbon/nitrogen/phosphorus (C/N/P) ratios among vegetation patch types in a degraded alpine steppe on the Qinghai-Tibetan Plateau.Materials and methodsWe examined soil, shoot and root C, N and P densities, and C/N/P ratios in a growing season for five vegetation patch types dominated by palatable plant speciesStipa purpurea,S. purpureaandPoa litwinowiana, and unpalatable plant speciesLeontopodium nanum,Artemisia nanschanica, andOxytropis glacialis.Results and discussionSoil C and N as well as shoot and root densities varied among patch types, but not soil C/N. Patches dominated by unpalatable plant species had a lower SOC density, lower soil and plant N/P ratios, and greater plant nutrient densities than those dominated by palatable plant species. Vegetation patch type strongly influenced nutrient densities and ratios in soil-plant systems, and sampling only areas dominated by palatable plant species may overestimate the C sequestration rate at the ecosystem scale.ConclusionsEven though patch-level plant biomass and nutrient density may increase with increasing degradation, the decrease in palatability and SOC storage at the ecosystem scale would impair grassland sustainability as alpine grassland degradation proceeds. The palatability of plants should thus be considered for improving regional SOC stock estimate in future research.
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