| Distance of edge influence of soil moisture and nutrients in walnut-millet intercropping systems in the Loess Plateau in west Shanxi Province |
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| DOI：10.7606/j.issn.1000-7601.2016.06.23 |
| Key Words: walnut-millet intercropping systems soil moisture soil nutrients distance of edge influence the main competition area the Loess Plateau in west Shanxi Province |
| 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), 100083, Beijing, 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 | | CHANG Yi-fang | College of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China | | CAI Zhi-cai | College of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China |
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| Abstract: |
| In order to divide the main competition area for intercropping systems and provide a theoretical guidance for the sustainable and efficient management of intercropping systems on the Loess Plateau in west Shanxi Province, the walnut-millet intercropping system was studied. Soil moisture and nutrients in the intercropping systems were monitored. Moving split window technique was used to detect the distance of edge influence of soil moisture and nutrients in the intercropping systems. The results showed that when the window width reached 2, the distance of edge influence of soil moisture and nutrients could be detected by moving split window technique. It is difficult to determine the distance of edge influence in 40～100 cm soil layer because soil moisture and nutrients content at different distances from the tree row were quite similar. Combining soil moisture in 0～40 cm and 0～100 cm soil layers, distance of edge influence of soil moisture was from 1.75 m away in the south to 1.25 m away in the north side of the tree, that was to say influencing width was 3 m, which means the main competition area of soil moisture ranged from 1.75 m south of the tree to 1.25 m north of the tree. Different soil nutrient indicators had different distance of edge influence. Taking into account of the distribution of four soil nutrient indicators (organic matter, total N, available P and available K) in 0～40 cm and 0～100 cm soil layers, distance of edge influence of soil nutrients was 2.25 m south away from the tree to 2.25 m north away from the tree and the influencing width was 4.5 m, which means the main competition area was from 2.25m south of the tree to 2.25 m north of the tree. Changing ridge and furrow, covering ridge and fertilizing selectively in the main competition area of soil moisture and nutrients was proposed to ease the competition between walnuts and millet so as to improve efficiency of resource use and increase the income of local farmers. |
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