|
|
|
| Nutrient blocking effects of plant hedge with various rows on slope farmland nearby Hongfeng Lake |
| Cai Xianli, Zhou Yunchao, Liu Xiaoyun, Ma Liping, Tian Xiao |
| Forest College, Guizhou University, 550025, Guiyang, China |
|
|
|
|
Abstract In order to choose a appropriate width of plant hedge for soil and water conservation on slope farmland nearby Hongfeng Lake, different widths of plant hedge of mixed Vetiveria zizanioides and Tephrosia purpurea ( basic hedge were composed of 1 line Vetiveria zizanioides and 1 line Tephrosia purpurea, and 2 row hedge means 1 basic hedge. ) were designed, each plant hedge treatment with 3 bands, including 0 (control), 2, 4, 6 rows/ band, and 2-4-6 rows from top to bottom. Surface runoff, sediment and nutrients were compared. All indexes of treatments were lower than that of the control. According to the variance analysis and F-test, significant differences among different treatments were found. 1) Further multiple comparison results showed that nutrient elements were significantly blocked by the plant hedge treatments except for 2-rows/ band treatment. 2) There was no significant difference among treatments with 2-rows/ band, 4-rows/ band and 2-4-6 rows from top to bottom, but the difference between 6-rows/ band and 2-rows/ band treatments was significant. 3 ) There was only significant difference in blocking effect of soil P and K between the treatment of 6-rows/ band and other two treatments of 4-rows/ band and 2-4-6 rows from top to bottom. From results of both experiment and practical application, 4-rows/ band probably is the best choice for local place, followed by 2-4-6 rows from top to bottom.
|
|
Received: 06 January 2012
|
|
|
|
|
|
|
