Response Of Soil And Plant During Ecology Restoration In Liusha Basin

According to the data of field investigation for both plant identification and soil chemical analysis of 63 samplings in 2005 in the Liusha Basin, Hanyuan County, Sichuan Province, ecology restoration of the Liusha Basin were assessed by Multivariate Statisitical Analysis methods. Vegetation and soil character of samplings were analyzed under different ecology restoration degrees, simultaneously; and then restoration factors were studied, finally the sensitivity index for ecology restoration were brought forward in the light of forementioned analysis. The main results were as follows.The 13 initial indices from vegetation and soil were selected by correlation analysis combined with specialty knowledge, classifying sampling plots into 4 restoration degrees( In existing researches, it's hardly to find a quantitative Identification and defined definition to restoration degree. According to the actual situation of the Liusha Basin, this paper classified sampling plots into 4 restoration degrees, from degree I to degree IV).â‘ 6 indices were chosen to be the ecology restoration assessment indices, including biomass, diversity, gravel content, aggregation degree, SOM and SAK. K-means cluster associated with discriminant analysis was applied to classifying sampling plots into degreeâ… , degreeâ…¡, degreeâ…¢, and degreeâ…£. According to the diversity indice, the classified result was far away from the field investigation.â‘¡In the process of final classification, 5 picke-up factors were finally chosen to be the ecology restoration assessment indices. 63 samplings were classified into 4 sorts, 24 plots in degreeâ… ,15 plots in degreeâ…¡, 16 plots in degreeâ…¢, and 8 plots in degreeâ…£, respectively.Vegetation characters were analyzed under different ecology restoration degrees. Variance analysis indicated that as restoration degree enhanced, vegetation quantitative characteristics, species diversity and species richness indices were all significantly or highly significantly increased, on the whole.â‘ As far as species composition was concerned, 87 species were collected within investigated plots, among them, 6 families (Rosaceae, Gramineae, Coriaria, Compositae, Pinaceae, Ranunculaceae) were dominated. In a word, 36 species in degreeâ… , 39 species in degreeâ…¡, 31 species in degreeâ…¢, and 31 species in degreeâ…£.â‘¡Along with the improvment of restoration degree, both the biomass and cover were increased. Remarkably, the biomass would increase quickly when the level came to some extent. According to data analysis, both the biomass and cover could be treated as sensitivity index for restoration degree assessment in the Liusha Basin.Improvement of soil quality marked the ecology restoration. Variance analysis showed that depth, aggregation degree, SAK, TK, SAK, TP were of no significant difference among different restoration degree. Only gravel content, bulk density and SOM content presented a significant or highly significant increasing tendency. They could be treated as sensitivity index for restoration degree assessment in the Liusha Basin, too.