会宁县退耕还林还草工程植被生长状况分析

【目的】探究会宁县退耕还林还草工程中建设的植被的生长状况与适宜性.【方法】通过对典型地貌区实地调查,得到研究区植被状况的数量指标值(树种、高度、密度、频度、显著度等),分析与评价当地退耕还林还草工程中植被的生长状况.【结果】会宁县退耕还林还草工程所选用的林木和草本植物均较适宜研究区的生长环境,在不同的地貌区林木的种植基本体现了因地制宜的原则;对研究区植物重要值的计算分析得出,流域内刺槐的重要值(0.871 6)最大,是乔木林群落的优势树种,其他各树种重要值依次减小,各树种生长状况良好,群落结构合理;研究区山杏的高度由沟壑区-梁区-塬区呈显著增加的趋势,柠条的高度由沟壑区-梁区-塬区呈先减后增的变化趋势,紫花苜蓿的高度由沟壑区-梁区-塬区呈显著增加趋势.【结论】通过退耕还林还草工程建设,会宁县植被生长状况良好,植被覆盖面积大幅度增加,并取得了较好的生态效益.

Vegetation growth of the returning farmland to forest and grassland proj ect in Huining County

Obj ective]In order to explore the vegetation growth and suitability of returning farmland to forest and grassland proj ect (RFFGP)in Huining County.Method]Vegetation growth status of local RFFGP was analyzed and evaluated by surveying quantitative indices for vegetation condition (tree species, height,density,frequency,predominance,etc.).Result]Tree and grass species selected for RFFGP were all more suitable to environment of research area,showing the principle of adj usting measures to local con-ditions.According to the important value,Robinia pseudoacacia was the maximum reaching 0.871 6 and the dominant tree in the tree community and those of other species reduced sequentially.Each species grew well and the community structure was reasonable.The tree height of Armeniaca sibirica significantly increased in the order gully region,beam area,tableland area,Caragana korshinskii height decreased then increased by gully region-beam area-tableland and height change of Medicago sativa was similar o that of Armenia-ca sibirica.Conclusion]It is suggested that after the construction of RFFGP vegetation grow well,vegeta-tion cover increases significantly and gets good ecological benefits in Huining County.