International Journal of Advance Agricultural Research
ISSN: 2053-1265
Vol. 5(3), pp. 52-60, April 2017



Spatial distribution characteristics of phosphorus and potassium in small watershed of grassland

Fengna Xue1, Ruiqiang Zhang2, Tianming Gao2, Lin Wang1, Wenbang Gao1, Jing Shi1, Shanshan Sun1, Junxiu Liu1, Rina Su1, Yunhu Xie1, Chunxing Hai1 and Xiaojia Li2*

1Inner Mongolia Normal University, Hohhot, 010020, China.
2Institute of Water Resource for Pastoral Area, the Ministry of Water Resources of the People’s Republic of China.

*To whom correspondence should be addressed. E-mail: lixiaojia1981128@163.com.

Received 21 March, 2017; Received in revised form 10 April, 2017; Accepted 12 April, 2017.

Abstract


Keywords:
Watershed, Phosphorus and potassium content, Spatial distribution.


Phosphorus (P) plays an important role in plant nutrition. Many important organic compounds in plants contain phosphorus, which can promote crop growth and enhance the cold and drought resistance of crops. Potassium (K) can promote photosynthesis, increase plant uptake and utilization of nitrogen. In small grasslands, the growth status of vegetation is closely related to phosphorus and potassium; therefore, it is important to understand the spatial distribution of P and K in watersheds. In this report, a small closed watershed of Xilamu grassland was selected as the study site. The total phosphorus and potassium contents of soil samples were detected by laser induced percussion technique and the contour map of phosphorus and potassium elements in the watershed were plotted by CAD and other mapping software. By analyzing the distribution of contour maps, the spatial distribution characteristics of phosphorus and potassium in the watershed were determined. The distribution of phosphorus and potassium elements in the watershed has some similarities. Both elements are abundantly rich in the study area. The content of phosphorus and potassium in the runoff area of the watershed was also relatively high.

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