| The dynamic change and the competition area of soil moisture in apple-peanut intercropping system |
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| DOI：10.7606/j.issn.1000-7601.2018.01.14 |
| Key Words: the Loess Plateau of west Shanxi Province apple-peanut intercropping system soil moisture the main competition area |
| Author Name | Affiliation | | WANG Dan | College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China | | BI Hua-xing | College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
Ji county station, Chinese National Ecosystem Research Network (CNERN), Beijing 100083, China
The Collaborative Innovation Center for Promoting Ecological Functions of Forestry and economic trees, Beijing 102206, China | | XU Hua-sen | College of Resource and Environment, China Agricultural University, Beijing 100094, China | | CAI Zhi-cai | College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China | | CHANG Yi-fang | College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China | | CHEN Yue | College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China |
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| Abstract: |
| The objective of this study is to analyze moisture dynamic changes and the main competition area in apple-peanut intercropping system and improve the productivity of rainfall and the efficiency of soil moisture in the intercropping systems on the Loess Plateau of west Shanxi Province. Soil moisture contents between two rows of apple trees (spacing of 5 m) and at different distances from the apple trees were monitored by oven drying method. And the main competition area was investigated with the moving split window technique. Overall, soil moisture content was low and the maximum did not exceed 20% in different phenophases (including seedling stage, flowering stage, bearing pod stage and mature stage) of peanut. In addition, soil moisture content was significantly different among phenophases. The soil moisture content of seedling stage and mature stage was higher than flowering stage and bearing pod stage while the lowest was in flowering stage. Taking 2.5 m from apple trees as the dividing line, soil moisture content decreased at first and then increased with the increase of the distance from trees, and the lowest soil moisture content was detected when the distance is around 1.2 m from the trees. In four different phenophases of peanut, comparing with peanut monoculture system,soil moisture in apple-peanut intercropping system showed negative effect, namely -25.16% - 20.26% - 12.97% and -11.13%. The main competition area of seedling stage was 0.8～2 m away from the south side of apple trees and 0.8～1.8 m away from the north side of apple trees, where the competitive width is 2.2 m. The main competition area of flowering stage was 0.8～1.8 m away from the south side of apple trees and 1～2 m for the north side. The minimum competitive width of soil moisture was in both bearing pod stage and mature stage which was 1.8 m simultaneously. The main competition area in bearing pod stage was 0.8～1.8 m away from the south side of apple trees and 0.8～1.6 m away from the north side of apple trees. Meanwhile, in the mature stage, the main competition area is 0.8～1.6 m away from the south side of apple trees and 0.8～1.8 m away from the north side of apple trees. |
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