Impact of Precipitation Patterns on Biomass and Species Richness of Annuals in a Dry Steppe

Impact of Precipitation Patterns on Biomass and Species Richness of Annuals in a Dry Steppe
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降水模式对干燥草原一年生植物生物量和物种丰富度的影响

DOI:
10.1371/journal.pone.0125300
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发表时间:
2015-04
期刊:
影响因子:
3.7
通讯作者:
Sheng, Lianxi
Sheng, Lianxi
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Liu, Zhongling;Miao, Bailing;He, Chunguang;Sheng, Lianxi

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一年生植物是干旱半干旱草地生态系统植物群落的重要组成部分。虽然众所周知,降水量对群落或多年生植物的生产力和物种丰富度有显着的影响,然而,由于缺乏测量,特别是长期的实验数据,有很少的信息是如何影响的数量和模式的一年生植物类似的属性。本文利用内蒙古草原生态系统研究站29年的数据,分析了降水量和时间格局对地上生物量、地上生物量年际变化、相对地上生物量和一年生植物物种丰富度的影响,从而解决了这一知识空白。结果表明,随着降水量的增加,一年生植物地上生物量和相对地上生物量增加。一年生植物地上生物量的变异系数随年降水量和生长季降水量的增加而显著降低。一年生植物物种丰富度随年降水量和生长季降水量的增加而显著增加。总的来说,这项研究突出了降水对地上生物量和一年生植物物种丰富度的重要性。
Annuals are an important component part of plant communities in arid and semiarid grassland ecosystems. Although it is well known that precipitation has a significant impact on productivity and species richness of community or perennials, nevertheless, due to lack of measurements, especially long-term experiment data, there is little information on how quantity and patterns of precipitation affect similar attributes of annuals. This study addresses this knowledge gap by analyzing how quantity and temporal patterns of precipitation affect aboveground biomass, interannual variation aboveground biomass, relative aboveground biomass, and species richness of annuals using a 29-year dataset from a dry steppe site at the Inner Mongolia Grassland Ecosystem Research Station. Results showed that aboveground biomass and relative aboveground biomass of annuals increased with increasing precipitation. The coefficient of variation in aboveground biomass of annuals decreased significantly with increasing annual and growing-season precipitation. Species richness of annuals increased significantly with increasing annual precipitation and growing-season precipitation. Overall, this study highlights the importance of precipitation for aboveground biomass and species richness of annuals.
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