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| DOI：10.13522/j.cnki.ggps.20190126 |
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| Experimental study on water and nitrogen dynamics in soil under different land usages in central yunnan plateau |
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YANG Cuiping, TUO Yunfei, SHEN Fangyuan, MA Jimin, WU Yaozhong
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1. Ecology and Environment Department in Southwest Forestry University, Kunming 650224, China;2. Water Resources Bureau, Jinning District, Kunming 650607, China
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| Abstract: |
| 【Objective】Water and nitrogen dynamics in soil was modulated by land use and cropping, and this paper aims to investigate the change and correlation of soil water and nitrogen under different land use in attempts to provide guidance for water and fertilizer management in red loam farmland in central Yunnan plateau.【Method】 The experiment was conducted in plots with contrasting land use under natural precipitation from June to October in 2018. The land use we studied included forest, garden, barren grass, slopes, with bare soil serving as the control. In each plot, we measured the water and nitrogen in the soil.【Result】In all treatments, water content increased with soil depth, and the mean total soil nitrogen under forest, garden, barren grass, slopes and bare soil was 1.67, 0.76, 0.70, 0.52 and 0.67 g/kg, respectively. Garden had the highest Nitrate content, being 13.39mg/kg in the 0~100 cm soil. Bare soil stored least nitrogen at 5.13 mg/kg. Ammonium content decreased first and then increased along the soil depth in both the forest and slope. The highest average total nitrogen from June to October was 0.92 g/kg, found in garden, and the lowest was 0.50 g/kg, found in the slope. Nitrate in forest, grass and slope, as well as ammonium in garden and bare soils, have all been declining with time. Both soil moisture and ammonium were correlated with soil depth at significant level (P<0.01), and nitrate and ammonium were correlated with time with their correlation coefficient being -0.440 and -0.442, and P being 0.028 and 0.027, respectively.【Conclusion】Soil moisture in red load farmland in central Yunnan plateau increased with soil depth. The spatiotemporal difference in soil nitrogen between different land use was significant. Soil total nitrogen content was not correlated to soil depth and time at significant level (P>0.05). |
| Key words: types of land usage; soil nitrogen; soil water content; central Yunnan plateau |
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