黄土高原4种植被带草本群落特征及其对降水变化的响应
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引用本文:姜基春,王国强,郭 宁,焦 峰.黄土高原4种植被带草本群落特征及其对降水变化的响应[J].西北植物学报,2019,39(10):1861~1867
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作者单位
姜基春1,王国强1,郭 宁2,3,焦 峰1,2* (1 西北农林科技大学水土保持研究所陕西杨陵 7121002 中国科学院水利部水土保持研究所陕西杨陵 7121003 中国科学院大学北京100049) 
基金项目:国家重点研发计划项目(2016YFA0600801)和科技基础性工作专项(2014FY210130)
中文摘要:以黄土高原草本群落为研究对象,选取陕西省榆林市榆阳区至延安市富县的4种植被带,测定草本群落物种多样性和生物量,结合研究区近20年的气象数据资料,分析4种植被带草本群落物种多样性和生物量的分布特征以及它们对降水变化的响应规律,以期为黄土高原植被恢复和水土保持生态建设提供参考。结果表明:(1)4种植被带草本群落Margalef指数、Pielou指数以及Shannon Wiener指数均为草原 荒漠带数值最小,森林带数值最大,且都随着年均降水量的增加呈先增大后减小的变化趋势,最大值都出现在森林 草原带。(2)地上、地下和总生物量的大小顺序均为草原 荒漠带<森林带<草原带<森林 草原带,它们随着年均降水量的增加呈“单峰曲线”的变化趋势,曲线的拐点都出现在森林 草原带;地下/地上生物量与年均降水量之间存在显著正相关关系。
中文关键词:草本群落  物种多样性  生物量  降水变化
 
Herbaceous Community Characteristics of Four Vegetation Belts and Their Responses to Precipitation Changes in the Loess Plateau
Abstract:In this paper, herbaceous communities in the Loess Plateau were taken as research object, four vegetation belts from Yuyang, Yulin, Shaanxi to Fuxian, Yanan, Shaanxi were selected to measure species diversity and biomass of herbaceous communities, combined with the meteorological data of the last 20 years in the study area. The distribution characteristics of species diversity and biomass of herbaceous communities in the four vegetation belts and their response rules to precipitation changes were analyzed, so as to provide references for vegetation restoration and ecological construction of soil and water conservation in the Loess Plateau. The results showed that: (1) Margalef index, Pielou index and Shannon Wiener index of herbaceous communities in the four vegetation belts were the smallest values in the grass desert belt and the largest values in the forest belt. The values increased first and then decreased with the increase of annual average precipitation, and the maximum values all appeared in the forest grass belt. (2) The order of aboveground, underground and total biomass is grass desert belt< forest belt< grass belt< forest grass belt. With the increase of annual average precipitation, they showed a trend of “single peak curve”, and the inflection points of the curves all appeared in forest grass belt. There is a significantly positive correlation between underground/aboveground biomass and annual average precipitation.
keywords:herbaceous community  species diversity  biomass  precipitation changes
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