垦殖对川西北高寒草地土壤中不同磷组分含量的影响
作 者：
雷玮倩;胡玉福;杨泽鹏;何剑锋;肖海华;舒向阳;阳帆;李正青
单 位：
四川农业大学资源学院
关键词：
川西北高寒草地;垦殖;土壤磷组分
摘 要：
选择川西北高寒草地垦殖3和10年后的川贝母种植地为研究对象,以邻近未开垦天然草地土壤为对照,采用修正后的Hedley磷元素分级方法,探究垦殖对川西北高寒草地土壤磷组分含量变化的影响.结果表明,垦殖导致了高寒草地土壤全磷(TP)、水溶性磷(H2O-Pi)、活性磷(NaHCO3-P)、潜在活性磷(NaOH-P)、中稳性磷(Dil.HCl-Pi)、高稳性磷(Conc.HCl-P)含量显著下降,残余态磷(Residual-P)显著上升.其中0~20 cm土层变化最显著,垦殖10年后,土壤TP、H2O-Pi、NaHCO3-P、NaOH-P、Dil.HCl-Pi和Conc.HCl-P分别下降了16.48%、78.98%、57.43%、26.06%、16.38%、10.87%,而Residual-P增加了40.08%.其中H2O-Pi、NaHCO3-P和NaOH-P含量变化显著高于其他组分的磷,说明磷的活性越高损失越明显.垦殖过程中,土壤H2O-Pi、NaHCO3-P和NaOH-P占全磷比重显著下降,而Dil.HCl-Pi、Conc.HCl-P和Residual-P呈上升趋势.垦殖前3年,土壤全磷及各形态磷组分的年下降率显著高于垦殖3~10年,说明垦殖过程中磷的损失主要发生在垦殖前期.
作 者：
LEI Wei-qian;HU Yu-fu;YANG Ze-peng;HE Jian-feng;XIAO Hai-hua;SHU Xiang-yang;YANG Fan;LI Zheng-qing;College of Resources, Sichuan Agricultural University;
单 位：
LEI Wei-qian%HU Yu-fu%YANG Ze-peng%HE Jian-feng%XIAO Hai-hua%SHU Xiang-yang%YANG Fan%LI Zheng-qing%College of Resources, Sichuan Agricultural University
关键词：
alpine meadow in northwest Sichuan;;reclamation;;soil phosphorus fractions
摘 要：
Alpine grassland in northwest Sichuan, dominated by Fritillaria cirrhosa and subject to 3 or 10 years development, was compared with nearby uncultivated natural grassland(Control) to explore the effects of development on the soil phosphorus fractions. Soil phosphorus tests were performed using a modified Hedley method. It was found that after development the levels of total phosphorus(TP), water-soluble phosphorus(H_2O-Pi), active phosphorus(NaHCO_3-P), potentially active phosphorus(NaOH-P), stable phosphorus(Dil. HCl-Pi) and highly stable phosphorus(Conc. HCl-P) were significantly lower than those of Control plots, while residual phosphorus(Residual-P) levels were significantly increased. These changes were most pronounced in the 0-20 cm soil layer. After 10 years of development, the levels of TP, H_2O-Pi, NaHCO_3-P, NaOH-P, Dil. HCl-Pi and Conc. HCl-P decreased by 16.48%, 78.98%, 57.43%, 26.06%, 16.38%, and 10.87% respectively, while Residual-P levels increased by 40.08%(P<0.05). H_2O-Pi, NaHCO_3-P and NaOH-P changed to a greater extent than the others, indicating the higher the activity, the greater the loss. With increased time under development, the ratios of H_2O-Pi, NaHCO_3-P, and NaOH-P to TP significantly decreased, while the ratios of Dil. HCl-Pi, Conc. HCl-P, and Residual-P to TP increased. In the early stages of development(0-3 years), TP and various phosphorus fractions changed faster than at the later stages(3-10 years), indicating that the losses of the various phosphorus fractions mainly occurred in the early stages of development(0-3 years).
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