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Seasonal variation and impact factors of available phosphorus in typical paddy soils of T aihu L ake region, C hina
Author(s) -
Chen Xiaomin,
Fang Kun,
Chen Can
Publication year - 2012
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2011.00299.x
Subject(s) - phosphorus , soil water , eutrophication , organic matter , chemistry , paddy field , linear correlation , agronomy , environmental science , zoology , soil science , nutrient , mathematics , biology , statistics , organic chemistry
Phosphorus loss from soil can play an important role in eutrophication of aquatic bodies. The seasonal variation of available phosphorus in soil profiles of three major paddy soils ( B ai soil, H uangni soil and W ushan soil) during wheat and rice growth seasons was studied in the T aihu L ake region of C hina. The results were as follows: the available phosphorus contents differed in the three paddy soils. Available phosphorus content in B ai soil was the lowest in these soils. The available phosphorus content decreases rapidly with depth from the soil surface and reach the minimum value at approximately 45 cm before increasing slightly near the groundwater. The contents of available phosphorus were higher in F ebruary (tillering and shooting period of wheat) and in S eptember (full heading time of rice) than in other months. The total phosphorus content strongly affects available phosphorus content in the studied soils. During the period of wheat cultivation, they show a typical power function relationship with correlation coefficient r = 0.6492** ( n = 13), a significant positive linear correlation. In addition, available phosphorus content has a remarkable positive linear correlation with organic matter content, r = 0.9111** ( n = 13), and a remarkable negative linear correlation with pH value, r = −0.5945* ( n = 13). In W ushan soil, there is a negative linear correlation between clay content and available phosphorus content, r = −0.9289* ( n = 4). Therefore, total phosphorus content, organic matter content and pH value are major impact factors on available phosphorus content in these soils.