关键词: 物种多样性, 退耕还林, 植被类型, 嘉陵江上游

Abstract: Species diversity is one of the key indices, which can be used to evaluate the stability of forest community. It is important to enhance environment and control the loss of soil and water that the higher species diversity should be maintained within the artificial vegetation in gravely degraded land. Therefore, the species diversity within the different restoration forests of soil and water conservation in low hill heavy rain area of the upper reach of the Jialing River has been surveyed. The results indicate:the species diversity and important value of communities in different restoration stands vary greatly (in table 2 and 3); the species richness and diversity indices of communities in different restoration stands vary greatly (in table 4); the artificial restoration is beneficial to maintain higher biodiversity; the positive vertical structures of tree, shrub and herb can be reached by selecting the reasoning plantation density and afforesting the kilter mixed forest.

Key words: species diversity, sloping farmland conservation, vegetation types, the upper reach of Jialing river