|
|
|
| Effects of different vegetation restoration patterns on soil erosion in secondary Pinus massoniana pure forest |
| （Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Science, 210008, Nanjing, China） |
|
|
|
|
Abstract in this study, based on the measured data of runoff and sediment of the runoff plots during 2010 to 2011 in secondary Pinus massoniana forest in the Ganxian County of Jiangxi province, the benefits of soil and water conservation of different vegetation restoration patterns (Paspalum notatum, herbal; Lespedeza bicolor, shrub) in the secondary Pinus massoniana pure forest were analyzed. The results indicated that soil erosion is serious in secondary Pinus massoniana sparse pure forest, annual runoff coefficient was 0.50-0.60 and erosion modulus was in the range of 2700-6000t/(km2·a). Soil erosion intensity was reduced by surface vegetation restoration. However, the benefits of soil and water conservation of different vegetation restoration patterns were closely related to surface coverage and canopy structure. Benefits of water detention and soil conservation of vegetation restoration were 50%-60% and 65%-70% respectively when tree-herbal or tree-shrub structure formed a complex hierarchy in pure forest. Meanwhile, benefits of soil and water conservation were also affected by vegetation and rainfall types. Benefit of water detention initially increased then decreased with rainfall, and rainstorm was the inflexion for Paspalum notatum, and changed complex for Lespedeza bicolor. However, benefit of soil conservation reduced with rainfall, especially declined rapidly in heavy rainstorm.
|
|
Received: 09 March 2012
|
|
|
|
|
|
|
