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为理解人工林土壤磷截留与淋溶流失特征随降水格局的变化,研究了2013年12月至2014年12月期间,四川盆地桢楠和马尾松人工林土壤磷元素在旱季早期、旱季末期、雨季早期、雨季中期和雨季末期5个关键时期的输入、淋溶输出和截留过程.通过连续采样,分析了水溶性全磷(TDP)、水溶性有机磷(DOP)和溶解性反应磷(DRP).研究结果表明,桢楠和马尾松林土壤对TDP的截留量别为2.65和0.84 kg·hm-2·a-1,土壤TDP淋溶输出量分别为1.10和3.23 kg·hm-2·a-1,其中,截留和淋失的土壤DOP占TDP的84%以上.桢楠和马尾松林土壤的磷截留和淋溶输出过程主要集中于旱季早期、旱季末期和雨季早期,并且两地土壤DOP和TDP的淋溶输出量及桢楠林土壤DOP和DRP的截留量都随这3个时期呈显著增加趋势,马尾松林土壤DRP的截留量随5个时期呈递减趋势,且雨季早期的土壤DOP的截留量为-0.46 kg·hm-2,表现为净流失.桢楠人工林土壤在雨季中期和雨季末期的DRP也表现为净流失.桢楠林土壤DRP的输入量和截留量与降水量呈显著正相关(p<0.01),其输出量与降水量不相关.马尾松林土壤DOP和DRP的输入量、土壤DOP的截留量和土壤DRP的输出量与降水量显著正相关(p<0.01).此外,桢楠和马尾松林土壤磷的淋溶输出和截留量与对应磷组分的输入量呈显著正相关(p<0.01),但马尾松林土壤DOP的截留量与DOP的输入量不相关.由此可见,桢楠和马尾松人工林土壤磷的淋溶输出形式以DOP为主,主要发生在旱季和雨季早期.
In order to understand the characteristics of phosphorus retention and leaching loss in the planted forests with the change of precipitation pattern, the effects of precipitation on the phosphorus content of P. phoenix and P. massoniana plantations in the Sichuan Basin from December 2013 to December 2014 were studied in the early dry season, the late dry season, Inputs, leaching processes and interception processes in the early, early, early, early and early rainy season were conducted in five key periods, including water soluble total phosphorus (TDP), water soluble organic phosphorus (DOP) and dissolved reactive phosphorus ) .The results showed that the TDP interception of Pinus massoniana and Pinus massoniana forest soil was 2.65 and 0.84 kg · hm-2 · a-1, respectively, and the TDP leaching output was 1.10 and 3.23 kg · hm-2 · a -1, of which the DOP of intercepted and leached soil accounted for more than 84% of TDP.The P retention and leaching of soil in Pinus massoniana and Pinus massoniana forest mainly concentrated in the early dry season, late dry season and early rainy season, and the soil DOP And TDP and DOP and DRP interception of Pinus massoniana forest all increased with the three periods. The interception of soil DRP in Pinus massoniana forest decreased with the increase of five periods, and the soil DOP The interception of -0.46 kg · hm-2, the performance of the net loss DRP also showed a net loss during the middle of the rainy season and the end of the rainy season in Manchurian boll plantation. The input and interception of DRP in the soil of Pinus massoniana forest were positively correlated with the precipitation (p <0.01), and the output was not correlated with the precipitation The input of DOP and DRP, the interception of soil DOP and the output of soil DRP in Pinus massoniana forest were positively correlated with the precipitation (p <0.01) .In addition, the leaching and retention of phosphorus in Pinus massoniana and Pinus massoniana forest soil (P <0.01), but there was no correlation between the amount of DOP and the input of DOP in Pinus massoniana forest so that the leaching of soil phosphorus in Pinus massoniana and Pinus massoniana plantation The main output form is DOP, mainly in the dry season and early rainy season.