Effects of long-term fertilization and mulch on soil fertility in contour hedgerow systems: A case study on steeplands from the Three Gorges Area,China |
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Authors: | Zhi-Hua Shi Li-Ding Chen Chong-Fa Cai Zhao-Xia Li Guo-Hua Liu |
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Affiliation: | (1) State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, PO Box 2871, Beijing, 100085, Peoples Republic of China;(2) Key Lab of Subtropical Agriculture and Environment Ministry of Agriculture, Huazhong Agricultural University, Wuhan, 430070, Peoples Republic of China |
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Abstract: | The use of contour hedgerows is widely advocated to sustain crop production and reduce soil loss on steeplands in the Three
Gorges Area of China. However, little is known about the effects of soil management on soil fertility within these systems,
or about the spatial gradients in soil nutrients that may develop in terraces formed behind the vegetative barriers. Therefore,
we carried out a study on the effects of various long-term soil management practices on soil fertility and spatial variation
of fertility between hedgerows. At a site in the Three Gorges Area, China, we applied five treatments to a contour hedgerow
system: control (no fertilizer and manure); chemical fertilizer (CF); chemical fertilizer and mulch (CF + MU); pig manure
(PM); and mulch, pig manure, and chemical fertilizer (CF + PM + MU). Soil samples were collected from the topsoil horizon
(0–20 cm) of the selected five treatments in 2006 after 11 crop cycles, and physical and chemical properties were analyzed.
The results showed that chemical fertilizer clearly improves nutrient status of the topsoil, while pig manure also increased
the amount of soil organic matter. This increase in organic matter was associated with an increase in soil aggregate stability,
a reduction in bulk density, and reduced penetration resistance of the soil. Mulch with pig manure and chemical fertilizer
was the best management practice for improving soil quality and crop yields in the Three Gorges Area. Further, mulch and pig
manure addition also decreased the magnitude of the spatial variation, but did not offset the soil fertility gradients because
tillage resulted in significant movement of soil. More favorable soil properties were found at the lower positions within
each alley, regardless of the management practice applied. |
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Keywords: | Soil physical properties Soil chemical properties Fertility gradient Crop yield Contour hedgerow |
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