Realistic loss of plant species diversity decreases soil quality in a Tibetan alpine meadow
Realistic loss of plant species diversity decreases soil quality in a Tibetan alpine meadow
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植物物种多样性的实际丧失降低了西藏高寒草甸的土壤质量
DOI：
10.1016/j.agee.2019.03.019
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发表时间：
2019-07
影响因子：
6.6
通讯作者：
Du Guozhen
中科院分区：
文献类型：
--
作者：
Zhou Xianhui;Wu Wenjuan;Niu Kechang;Du Guozhen
随着气候条件和放牧制度的快速变化，土壤质量下降已成为西藏牧场可持续发展的主要挑战。越来越多的证据强调了植物生物量的重要性，但很少有研究测试植物多样性的实际丧失对土壤质量的影响。我们假设物种多样性的丧失将降低土壤质量，不仅通过失去常备生物量（即“质量效应”），而且还直接通过“多样性效应”的丧失。考虑到过度放牧、放牧排斥和气候变化导致物种多样性的实际丧失，我们通过实验从西藏高山草甸中去除草、莎草和各种杂草物种来检验这一假设。目标植物物种被移除五年后，我们利用贝叶斯线性混合效应模型检查了物种移除对植物群落和土壤质量的影响，并利用贝叶斯网络推断了植物和土壤之间的潜在因果关系。结果表明：（i）总体而言，植物物种的去除不仅显着降低了植物多样性和生物量，而且还降低了土壤有机质和养分； (ii) 站立生物量因莎草和草类物种的去除而下降更明显，但植物多样性和土壤养分因各种杂草物种的去除而下降更显着； (iii)物种多样性的丧失而不是生物量的丧失与土壤质量的下降直接相关，特别是土壤有效磷的减少。简而言之，我们的结果表明，植物物种多样性的实际丧失会通过失去“多样性效应”来降低西藏高寒草甸的土壤质量。植物物种多样性在维持土壤质量方面的功能意义支持了当地牧民的期望，即通过传统轮牧方式促进植物多样性可以确保高山土壤和西藏牧场的可持续性。
With rapid changes in climate conditions and grazing regimes, a decline in soil quality has become a main challenge for sustainability of Tibetan rangeland. Increasing evidence highlights the significance of plant biomass, but few studies test the role of realistic loss of plant diversity in impacting soil quality. We hypothesized that loss of species diversity will decrease soil quality, not only through lost standing biomass (i.e., “mass effect”) but also directly via the loss of the “diversity effect”. Considering the realistic loss of species diversity following overgrazing, grazing exclusion and climate change, we experimentally removed grass, sedge and various forb species from a Tibetan alpine meadow to test this hypothesis. After target plant species had been removed for five years, we examined the effect of the species removal on the plant community and soil quality with Bayesian linear mixed effect models and inferred potentially causal linkages between plants and soil with a Bayesian network. Results showed (i) overall, plant species removal not only significantly decreased plant diversity and standing biomass but also decreased soil organic matter and nutrients; (ii) the standing biomass decreased more pronouncedly in response to the removal of sedge and grass species, but plant diversity and soil nutrients decreased more pronouncedly in response to the removal of various forb species; and (iii) the loss of species diversity rather than standing biomass was directly associated with the decline in the soil quality, especially a decrease in soil available P. In short, our results indicate that realistic loss of plant species diversity can decrease soil quality in a Tibetan alpine meadow through lost the “diversity effect”. The functional significance of plant species diversity in maintaining soil quality supports the expectation of local pastoralists that diverse plants, promoted by traditionally rotational grazing, can ensure the sustainability of alpine soil and Tibetan rangeland.
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影响因子：
4.9
作者：
Niu, Kechang;Zhang, Shiting;Du, Guozhen
通讯作者：
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影响因子：
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期刊：
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