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当前位置: 首页 > 文章 > 不同干扰方式对桂西北灌草植被物种多样性和生产力的影响 水土保持研究 2016,23 (4) 288-293+299
Position: Home > Articles > Effects of Different Disturbances on Species Diversity and Productivity of the Shrub-Grass Vegetation on the Degraded Land in Northwest Guangxi,China Research of Soil and Water Conservation 2016,23 (4) 288-293+299

不同干扰方式对桂西北灌草植被物种多样性和生产力的影响

作  者：
韦兰英;韦启忠;莫祝平;童德文
单  位：
广西林业勘测设计院
关键词：
干扰;多样性;生产力;灌草植被;退化土地;桂西北
摘  要：
灌草植被在生态系统功能的维持中发挥着重要作用,不同的干扰方式可能改变退化土地灌草植被的多样性及其分布格局,甚至多样性与生产力的关系。以未受干扰的植被作为对照,研究放牧和火烧两种主要干扰对桂西北灌草植被的物种多样性和生产力的影响,并分析了两者之间的关系。结果表明:放牧和火烧处理均降低了灌木的物种丰富度和Shannon-Wiener多样性指数,但放牧处理的均匀度指数与对照相比无显著差异,火烧处理反而显著增加了其均匀度指数。对草本而言,放牧不影响物种丰富度指数,但显著降低了Shannon-Wiener多样性指数和均匀度指数;火烧显著降低了物种丰富度指数,但不影响Shannon-Wiener多样性指数和均匀度指数。与对照相比,放牧和火烧均降低了灌木的地上和地下部分生物量,但两者对草本的地上和地下生物量却产生了正面影响或无影响。此外,这两种干扰方式对灌木和草本多样性与生产力间关系的影响具有不一致性。
译  名：
Effects of Different Disturbances on Species Diversity and Productivity of the Shrub-Grass Vegetation on the Degraded Land in Northwest Guangxi,China
作  者：
WEI Lanying;WEI Qizhong;MO Zhuping;TONG Dewen;Guangxi Forest Inventory and Planning Institute;
关键词：
disturbance;;species diversity;;productivity;;shrub-grass vegetation;;degraded land;;Northwest Guangxi
摘  要：
Shrub-grass vegetation plays an important role in maintaining the functions of ecosystems.On degraded lands,different disturbances might alter species diversity and distribution pattern of shrub-grass vegetation,and even the relationship between plant species diversity and productivity.However,our knowledge of the consequences of these effects on diversity and composition of ground flora remains very poor.In this study,we examined the species diversity,productivity and the relationship between diversity and productivity in undisturbed,grazing and fire vegetation of northwest Guangxi.It′s found that shrubs exhibited lower species richness and Shannon-Wiener index under both grazing and fire treatments than those of the undisturbed site.Moreover,compared with undisturbed treatment,the evenness index of shrubs differed insignificantly under grazing treatment,while it′s reduced by fire treatment.With respect to grass species,grazing had no influence on their diversity,but it did reduce the Shannon-Wiener index and evenness index distinctly.On the contrary,fire treatment decreased the grass species diversity,whereas it showed little effect on the Shannon-Wiener index and evenness index.In addition,the relationship between species diversity and productivity of shrubs and grasses was also affected inconsistently by grazing and fire treatment.

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