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| Role of Tephrosia candida DC. in rocky desertification in Karst areas |
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| DOI：10.16768/j.issn.1004-874X.2016.11.012 |
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| Abstract: |
| In order to understand the role of Tephrosia candida DC. in rocky desertification management in
Karst areas，we conducted the program in Gelou village and Jiayou town，typical pilot sites of rocky desertification
management in Guangxi，planted T. candida and Aeschynomene indica L. under Cedrela wood and Chestnut wood，
while planted T. candida on slope as control group，and detected the vegetation diversity and changes in soil
nutrients. The results showed that，by planting T. candida in Karst areas，the vegetation coverage reached 20%-70%
in the first year，and increased to 95%-100% in the second year；water conservation increased by 3.85%-10.3%；
harmful wild species in the second year decreased by 20%-30.7% over the first year；soil available nitrogen was
remarkable improved by 6.14%-14.61%，total phosphorus and potassium content increased by 23.02%-51.66% and
38.10%-45.24% respectively，organic matter raised by 6.28%，soil organic matter of 86.7% of the area belonged to medium and higher grade；essential trace elements in the soil，such as Cu，Mn，Ni，Mo，Sn content increased；
the harmful metal elements except Cr，Pb，Ag，As，Hg content decreased obviously，and Hg was taken to the
second standard from third standard；soil pH of Gelou village，the control group，in the second year decreased by
6.47%-10.59% over the first year，but that of T. candida area increased by 0.4%-6.63%. The result revealed that，
planting T. candida in rocky desertification area could increase vegetation coverage，improve soil available nitrogen
content，water conversation and soil pH，could decrease harmful wild species and harmful metal elements，played
a powerful role in soil conversation and renovating ecologic environment，facilitated positive evolution of soil and
vegetation in rocky desertification area. |
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