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[1]WANG Bai-qun,JIANG Jun,DU Quan-sheng,et al.Characteristics of Accumulation of Nutrient Elements in Grasses and Soil Organic Carbon and Nutrients in Managed Grasslands in the Loess Hilly and Gully Area[J].Research of Soil and Water Conservation,2010,17(06):127-132.

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Characteristics of Accumulation of Nutrient Elements in Grasses and Soil Organic Carbon and Nutrients in Managed Grasslands in the Loess Hilly and Gully Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 17 Number of periods: 2010 06 Page number: 127-132 Column: Public date: 2010-12-20

Title:: Characteristics of Accumulation of Nutrient Elements in Grasses and Soil Organic Carbon and Nutrients in Managed Grasslands in the Loess Hilly and Gully Area

Author(s):: WANG Bai-qun^1,2, JIANG Jun², DU Quan-sheng³, CAO Qing-yu²; 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. Fuxian Bureau of Meteorology, Fusxian, Shaanxi 727500, China

Keywords:: managed grassland; nutrient element; soil organic carbon; characteristic of soil nutrient; loess hilly and gully area

CLC:: S812

DOI:: -

Abstract:: The plot experiments of planted grass were conducted to examine the impact of growing grasses in the lowland and the slope land on the levels of soil organic carbon and the changes in soil major nutrients. The objective of this study was to probe into the driving effects of various planted grasses on soil organic carbon and nutrients. The amount of nutrient elements accumulated in stalk and leaf, dead organs, litter and root of each grass followed the order of nitrogen (N)>potassium (K)>phosphorus (P). The amount of N, P and K accumulated in the aboveground mass of each grass is more than that in root. The quantity of nutrient elements returned to soil through the litter followed the order of N >K>P. The sum of N, P, K accumulated both in above ground mass and root obeyed the order of Medicago sativa L.> Panicum virgatum, Onobrychis viciaefolia Scop.> Lespedezadavurica Schindl.> Astragalus adsurgens Pall. Soil total nitrogen content (TN), soil organic carbon content (SOC), soil organic carbon reserves (OCR) and sequestrated organic carbon of each sown grass at lowland and slope land were higher that in bare land. Soil TN, SOC and OCR of lowland pastures were higher than pastures on slope land, while sequestrated organic carbon soil was lower than the latter. Soil TN in alfalfa land of lowland was the highest, whereas soil TN on slope land grown old world bluestem (Bothriochloa ischaemum, L.) was the highest. It can be seen that pasture cultivation can improved soil available nitrogen and potassium.

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