| 草原生态系统土壤-植被组分中氮、磷、钾、钙和镁的循环 |
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| 引用本文： | 张小川,蔡蔚祺,徐琪,熊毅.草原生态系统土壤-植被组分中氮、磷、钾、钙和镁的循环[J].土壤学报,1990,27(2):140-150. |
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| 作者姓名： | 张小川 蔡蔚祺 徐琪 熊毅 |
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| 作者单位： | 中国科学院南京土壤研究所;中国科学院南京土壤研究所;中国科学院南京土壤研究所;中国科学院南京土壤研究所 |
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| 摘 要： | 本文研究了内蒙古锡林河流域两种典型草原的生产力、营养元素在生态系统中的分配及其循环.研究表明,除C和N在植物组分中贮量稍高以外,P、K、Ca和Mg的99%以上存于土壤分室中.而植物组分中的营养元素则主要贮存于根系之中.1985年至1986年,羊草草原地上凋落物的形成量为234克·米-2,大针茅草原为88.4克·米-2;同期凋落物的消失量分别为219.6和91.1克·米-2;从活根向死根生物量的年转移量分别为1712和920克·米-2;根系的降解速率分别为0.00355和0.00365克·克-1·天-1.文中给出了诸元素在生态系统中的循环图,讨论了两类草原生态系统中元素循环的特点.
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| 关 键 词： | 草原生态系统 土壤 植被 元素循环 |
CYCLING OF NITROGEN,PHOSPHORUS,POTASSIUM,CALCIUM AND MAGNESIUM IN GRASSLAND SOIL-VEGETATION SYSTEMS |
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| Zhang Xiaochuan,Cai Weiqi,Xu Qi and Hseung Yi.CYCLING OF NITROGEN,PHOSPHORUS,POTASSIUM,CALCIUM AND MAGNESIUM IN GRASSLAND SOIL-VEGETATION SYSTEMS[J].Acta Pedologica Sinica,1990,27(2):140-150. |
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| Authors: | Zhang Xiaochuan Cai Weiqi Xu Qi and Hseung Yi |
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| Institution: | Institute of Soil Science, Academia Sinica, Nanjing;Institute of Soil Science, Academia Sinica, Nanjing;Institute of Soil Science, Academia Sinica, Nanjing;Institute of Soil Science, Academia Sinica, Nanjing |
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| Abstract: | The productivity and allocation of nutrient elements and the biological nutrient cycling in two typical grasslands in the Xilin River Valley,Inner Mongolia were studied.Results obtained showed that the above-ground biomass was about 210g·m-2.in Aneurolepidium chinense steppe (A.C.S.) and around 140-170 g·m-2 in Stipa grandis steppe(S.G.S.).The under-ground biomass was 2837g·m-2 in A.C.S.and 1596g·m-2 in S.G.S.(0-100cm) in 1985,and 1627 and 870g·m-2(0-70cm) in 1986,respectively.The Root/Shoot ratio varied from one grassland type to another and from year to year being in the range of 5-12. |
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