| 再论聚土免耕垄的中层培肥 |
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| 引用本文： | 陈实,李同阳,张先婉.再论聚土免耕垄的中层培肥[J].山地学报,1996(Z1). |
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| 作者姓名： | 陈实 李同阳 张先婉 |
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| 作者单位： | 中国科学院、水利部成都山地灾害与环境研究所，中国科学院、水利部成都山地灾害与环境研究所，中国科学院、水利部成都山地灾害与环境研究所 成都 610041，成都 610041，成都 610041 |
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| 摘 要： | 聚土免耕垄的土壤结构性变化主要表现在中上层,以中层更突出.而土壤养分状况、水分状况、生物活性及有机无机复合胶体的变化却主要表现在中下层.多数肥力指标均显示中层的改善为最大.这与有机肥深施至中层有关.聚土免耕垄的培肥重点是中层.
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| 关 键 词： | 聚土免耕 土壤肥力 层次性变化 中层培肥 |
A FURTHER STUDY ON SUB-SURFACE LAYERS AMELIORATION UNDER SNTRCS |
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| Chen Shi Li Tongyang Zhang Xianwan.A FURTHER STUDY ON SUB-SURFACE LAYERS AMELIORATION UNDER SNTRCS[J].Journal of Mountain Research,1996(Z1). |
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| Authors: | Chen Shi Li Tongyang Zhang Xianwan |
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| Abstract: | Seasonal No-Tillage Ridge Cropping System (SNTRCS)significantly ameliorated soil structure, especially improving the soil structure in sub-surface soils (15-35cm). Compared to the controls, SNTRCS of increasing soil aggregation including water-stable structure aggregates in top soils (0-15cm)and sub-surface soils (15-35cm).The characters of organo-inorganic complex also indicated the SNTRCS increased complex quantity by 45. 0% ,complex degree by 3. 6% within 15-35cm soil layers compared to the controls. According to successive measurements of soil bulk density within ridges for 10a (1985-1991),the soil bulk density within sub-surface layers (15-35cm) deceased and has remained less than 1. 3g/cm3 for l0a.An analysis of micromorphology on soils under SNTRCS management showed that the aeration porosity of 1. 0-0, 2mm was increased 7. 1%-21. 2% in surface layers (0-15cm) and 11. 8%-16. 2% in sub-surface layers (15-35cm) compared to the controls.According to measurements of soil nitrogen, organic matter, soil enzyme activities and microbes,SNTRCS significantly increased soil N nutrition and biological activities in sub-surface layer (15-35cm) and sub-soil layer ( 35-50cm ), but little differences in top layers (0-15cm). Total N,organic matter,total microbes,aerobic fiber-decomposing bacteria,urease activity, alkaline phosphatase, invertase were increased by 20%-80% or more in the subsurface layer and sub-soil layer. This improvement of the nutrition status in the sub-surface layers and sub-soils is significant for crop growth during it' s reprodutive period.On the basis of mentioned above, sub-surface layers amelioration is a very important function in SNTRCS. |
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| Keywords: | SNTRCS soil fertility horizon of soil sub-surface layers amelioration |
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