本文選題：高寒草原　切入點：退化演替　出處：《新疆農(nóng)業(yè)科學(xué)》2017年04期 　論文類型：期刊論文

【摘要】：【目的】以新疆巴音布魯克高寒草原為對象,研究植被多樣性的退化演替規(guī)律,為高寒草原的科學(xué)管理提供理論依據(jù)�！痉椒ā坎捎每臻g退化梯度代替時間退化演替序列的方法,對巴音布魯克不同退化階段高寒草原植物群落進(jìn)行野外調(diào)查,運用α多樣性、β多樣性等指標(biāo)研究植被多樣性變化并探討其演替規(guī)律�！窘Y(jié)果】(1)Simpson優(yōu)勢度指數(shù)在草地退化后顯著上升了9.6%~13.7%,Margalef豐富度指數(shù)隨著退化演替的加劇基本呈先略微增加后顯著下降的變化趨勢,而Shannon-Wiener多樣性指數(shù)與Pielou均勻度指數(shù)均呈先增后降再增的波動變化;(2)隨退化程度的加劇,樣方內(nèi)微生境或資源異質(zhì)性減小,樣方間異質(zhì)性增大,從而導(dǎo)致β多樣性增加;Cody指數(shù)(二元屬性數(shù)據(jù))先升高后減小,沿著退化梯度,物種替代速率加快后逐漸減慢;輕度退化與中度退化、重度退化間Bray-Curtis指數(shù)較大,說明退化梯度之間存在較多的共有種。【結(jié)論】高寒草原在退化演替過程中群落物種組成發(fā)生替代變化,適口性好的物種減少,毒害草增加,導(dǎo)致草地質(zhì)量下降。
[Abstract]:[objective] taking Bayinbrook alpine steppe in Xinjiang as an object, the degradation succession law of vegetation diversity was studied to provide theoretical basis for the scientific management of alpine steppe. [methods] the spatial degradation gradient was used to replace the time degradation succession sequence. The plant communities of alpine steppe in different degraded stages of Bayinbrook were investigated in the field. Using 偽 diversity, 尾 diversity and other indexes to study the variation of vegetation diversity and its succession law. [results] the dominance index of Simpson rose significantly after grassland degradation, and the abundance index of Margalef increased significantly with the deterioration of grassland. The tendency to decrease significantly after a slight increase, However, the Shannon-Wiener diversity index and Pielou evenness index increased first, then decreased and then increased. With the increase of degradation degree, the microhabitat or resource heterogeneity decreased, and the heterogeneity between samples increased. As a result, the 尾 -diversity increased and then decreased and then increased, and then decreased, along the degradation gradient, the rate of species substitution slowed down gradually, and the Bray-Curtis index between mild and moderate degradation was higher than that of severe degradation. [conclusion] the species composition of alpine steppe community changed in the process of degradation, the species with good palatability decreased, the poisonous grass increased, and the quality of grassland decreased.
【作者單位】： 新疆農(nóng)業(yè)大學(xué)草業(yè)與環(huán)境科學(xué)學(xué)院;和靜縣草原工作站;
【基金】：國家自然科學(xué)基金項目“巴音布魯克高寒濕地CO2和CH4排放對水分變化的響應(yīng)”(41305136)~~
【分類號】：S812

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