短脚锦鸡儿扩张对典型草原植被与土壤的影响  

Influences of Shrub Caragana brachypoda Expansion on Vegetation and Soil in Typical Steppe on Loess Plateau

作　　者：赵凌平[1] 梁方晖 魏楠 谭世图 赵芙蓉[1] 李元晓[1] ZHAO Ling-ping;LIANG Fang-hui;WEI nan;TAN Shi-tu;ZHAO Fu-rong;LI Yuan-xiao(College of Animal Science and Technology,Henan University of Science and Technology,Luoyang 471000,China)

机构地区：[1]河南科技大学动物科技学院,河南洛阳471000

出　　处：《中国草地学报》2020年第2期169-174,共6页Chinese Journal of Grassland

基　　金：国家重点研发计划子课题(2018YFD0505001);国家自然科学青年基金项目(31302013);黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目(A314021402);河南科技大学博士启动基金项目(09001634)。

摘　　要：本文通过对比草本优势群落演替到灌木优势群落的地上植被特征、物种多样性和土壤养分,探讨灌木扩张对黄土高原典型草原生态系统的影响。结果表明,短脚锦鸡儿是入侵该封育区的主要灌木,目前该区草地正处于灌木定居阶段。随着短脚锦鸡儿的扩张灌木优势群落显著提高了地上生物量,而显著降低了草本植物的生物量和盖度,但对密度和枯落物厚度影响不显著。灌木扩张显著降低了地上植被的物种丰富度、Shannon-Wiener多样性指数和Simpson多样性指数,但Pielou均匀度指数呈上升趋势。灌木优势群落提高了20~60cm土层的有机碳含量和0~80cm土层的全磷含量,但对全氮含量影响不显著。The effects of shrub expansion on community structure and function was explored in the typical steppe on the Loess Plateau by analyzing the differences in vegetation structure, species diversity, soil nutrient between herbs dominant community and shrub dominant community. The results showed that Caragana brachypoda was the main invasion shrub species in this area, where the grassland was in the stage of shrub settlement at present. With the expansion of Caragana brachypoda, the shrub dominant community significantly increased total aboveground biomass, which induced reduction of herbaceous plant biomass and coverage. However, there was no significant effects shown on plant density and litter thickness. With the expansion of shrubs, species richness, Shannon-Wiener index and Simpson index were significantly decreased, while Pielou index was significantly increased in the shrub dominant community. The shrub expansion significantly improved soil organic carbon and total phosphorus contents at the depth of 20~60 cm and 0~80 cm soil layer, respectively. But no significant effects on the total nitrogen content was shown with the shrub expansion.

关 键 词：灌木扩张 物种多样性 优势群落 短脚锦鸡儿 

分 类 号：S812[农业科学—草业科学]