ANALYSIS OF TRAITS OF SOIL UNDER JATROPHA CURCAS PLANTATION IN PANZHIHUA, CHINA
Jatropha curcas L. is a widely cultivated bio-diesel plant in recent years and has a good application prospect in the future. Panxi dry-hot valley,one place where Jatropha curcas can grow best,is the most important industrial base for Jatropha curcas's production in China. However, Panxi dry-hot valley is an unstable ecotone in southwest China. Along with the industrialization of Jatropha curcas ' s production,the effect of Jatropha curcas plantation cultivated on a large scale on ecological environment has become a noticeable issue facing people. Selecting a 20 years old Jatropha curcas plantation as a sample plot and a nearby bare land that has same soil conditions as a control plot, we studied in present study physical and chemical traits of soil under Jatropha curcas plantation. The results show that natural water content of soil under Jatropha curcas plantation is very low in the end of November,almost reaching water content of air-dried soil, and that mean water content of surface layer air-dried soil is 2. 72±0. 51% in Jatropha curcas plantation and 2, 96±0. 31% in the control plot, respectively. In addition,organic matter content of surface layer soil is 2. 47±0. 62 g/kg in Jatropha curcas plantation and 2.47±0.62 g/kg in control plot,respectively. This indicates that organic matter content of surface layer soil in Jatropha curcas plantation is lightly lower than that in control plot, so does bottom layer soil. Total N content of surface layer is 1. 08±0. 31 g/kg in Jatropha curcas plantation and 1. 11±0. 31 g/kg in control plot respectively, while total N content of bottom layer is 0. 69± 0. 19 g/kg in Jatropha curcas plantation and 0. 96± 0. 24 g/kg in control plot respectively. The results of ANOVA demonstrates that differences of organic matter content,total N, total P, total K and pH between soil under Jatropha curcas plantation and soil under control plot are not statistically significant, which indicates that plantations have little improving effects on soil. Other analyses show that soil total N content was significantly correlated with individual height, mean crown-width and total branches, and that basal stem diameter of Jatropha curcas was positively correlated with total N and organic matter of surface layer soil very closely. Water, to a certain extent, is an important limiting factor that prevents Jatropha curcas plantation from regenerating. Especially,edaphic water of bottom layer is negatively correlated with regenerated seedlings evidently.
Jatropha curcasedaphic wateredaphic nutrientdry-hot valley
NETL
NSTL
万方数据
