樊博　闫帮国　史亮涛　潘志贤　岳学文　王春雪　李建查

摘 要 由于干热河谷地区生态环境相当脆弱，为了解元素添加对干热河谷植被群落结构的影响，试验选取了元谋干热河谷地段来研究元素添加对植物群落结构及物种多样性的影响。研究结果表明，添加不同元素后对植物群落结构参数产生了不同影响。不同元素添加后降低了双子叶植物群落多样性，而添加不同元素增加了单子叶植物的多样性，尤其是添加了K元素对单子叶植物群落的Simpson指数、Shannon-Wiener指数、Pielou均匀度、McIntosh指数起到了促进作用，与CK相比分别提高了2.28%、2.41%、2.37%、3.73%。24个试验小区的单子叶植物地上生物量>双子叶植物生物量；同时养分添加与植物多样性之间呈负相关关系。本研究可以用来调控植物多样性，更好的为生态恢复方面提供技术指导。

关键字 干热河谷 ；生物量 ；植物群落结构 ；物种多样性 ；相关性

中图分类号 Q948.1 文献标识码 A Doi：10.12008/j.issn.1009-2196.2016.10.022

Abstract The ecological environment in the dry-hot valley area was very vulnerable. Dry-hot valley in Yuanmou was selected to observe the effects of additional elements on the vegetation community structure to understand effects of exogenous elements on vegetation community structure in dry-hot valleys. The results showed that different elements had different effects on plant community structure parameters. The diversity of dicotyledon community decreased and the diversity of monocotyledon increased after different elements were added. K element promoted the Simpson index， Shannon-Wiener index， Pielou evenness， and McIntosh index of the monocotyledon community by 2.28%， 2.41%， 2.37% and 3.73%， respectively， as compared to the CK. The aboveground biomass of the monocotyledon was greater than that of the dicotyledon in 24 experimental plots. Meanwhile， the relationship between nutrient addition and plant diversity was negatively correlated. This study can be used to control plant diversity and provide technical guidance for ecological restoration.

Keywords Dry-hot valley ； biomass ； plant community structure ； species diversity ； correlation

干热河谷生态系统退化导致植物群落结构简单、系统生态功能逐渐丧失与稳定性不断下降，这些退化特征皆有可能与系统生物量结构和生物地球化学循环有密切的联系。群落植物结构及多样性与养分之间的关系一直被国外生态学家们所关注，并有很多有关这方面的研究[1-2]。在植物群落系统中，土壤作为重要的水分及养分资源的提供者，通过调节资源的供给与分配影响生态系统内的物种组成和群落动态，制约着生态系统的演替过程和对环境变化的响应[3]。有……