滇西北高山牧场入侵物种土大黄生态学调查

Ecological Investigation of the Invasive Specie Rumex nepalensis in Alpine Rangeland in NW Yunnan Province

2003年8月,对滇西北贡山县迪麻洛村色娃龙巴夏季高山牧场进行了植被和土大黄空间分布调查.结果表明:45%的样点中出现土大黄,9%的样点中覆盖率>25%;土大黄的出现与‘草地’景观、放牧强度、牧民住所的近远呈正相关,与海拔高度和坡度呈负相关;土大黄的分布和扩张与传统的轮牧体系息息相关.

The flora and the spatial distribution of the invasive specie Rumex nepalensis in Sewalongba Valley, an important alpine summer rangeland in Dimaluo village, Gongshan County, northwest Yunnan Province were investigated in August 2003. It was showed by the results that Rumex nepalensis appeared in 45% of the total sampled quadrates, and the coverage of the invasive species was over 25% of the surface area in 9% of the quadrates sampled. The occurrence of Rumex nepalensis was positively correlated with the degraded grassland landscape, the grazing intensity, and with the distance from the herdsman houses, whereas it was negatively correlated with the elevation and gradient of the slopes. The distribution and expansion of Rumex nepalensis was affected by local traditional grazing regimes.