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为了解马尾松(Pinus massoniana)人工林的降雨分配及对氮磷的截留作用,研究了宜宾高县来复镇18和32年生马尾松人工林的大气降雨量、穿透雨量和树干茎流量,并对其全磷(TP)、铵态氮(NH4+-N)和硝态氮(NO3--N)进行了测定。根据月降雨量的变化情况,将7—11月份划分为雨季、1—4月份划分为旱季。降雨量级大小影响林冠层截留量及其氮磷含量。不同林龄的马尾松林大气降雨、穿透雨和树干茎流中截留量的变化趋势与降雨量级的大小呈正相关,旱季林冠截留量小于雨季的截留量。马尾松人工林旱季大气降雨、穿透雨和树干茎流中的TP、NH4+-N、NO3--N月平均含量显著高于雨季,TP、NH4+-N、NO3--N含量在不同月份之间的变化明显,但18和32年生马尾松人工林林冠截留的N、P总含量差异不显著。大气降雨、穿透雨和树干茎流中的N、P含量与降雨量之间存在显著的负相关。
In order to understand the rainfall distribution and the interception of nitrogen and phosphorus in Pinus massoniana plantation, the atmospheric rainfall, the penetration rainfall and the stem-stem flow of 18- and 32-year-old masson pine forests in Laifu town, Yibin County, The total phosphorus (TP), ammonium nitrogen (NH4 + -N) and nitrate nitrogen (NO3 - N) were measured. According to the changes of monthly rainfall, July-November will be divided into rainy season and January-April will be divided into dry season. Rainfall magnitude affects forest canopy interception and its nitrogen and phosphorus content. The trend of rainfall, penetration and trunk stem flow interception in Pinus massoniana forest of different ages was positively correlated with the magnitude of rainfall. The interception of canopy in dry season was less than that in rainy season. The average monthly contents of TP, NH4 + -N and NO3 - N in the rainfall and throughflow and stem stems of the Pinus massoniana plantation in the dry season were significantly higher than those in the rainy season. The contents of TP, NH4 + -N and NO3 - N in different months However, there was no significant difference in total content of N and P intercepted in the canopy of 18- and 32-year-old masson pine forests. There was a significant negative correlation between rainfall and rainfall, and N and P content in rainfall and stem flow.