马尾松人工林林冠层降雨再分配及其氮磷特征

生态学杂志

马尾松人工林林冠层降雨再分配及其氮磷特征

张捷,刘洋,张健^**,欧江,崔宁洁

（四川农业大学生态林业研究所/四川生态林业工程重点实验室，成都 611130）

出版日期:2014-06-10 发布日期:2014-06-10

Rainfall redistribution by crown layer and variation characteristics of nitrogen and phosphorus in Pinus massoniana plantations.

ZHANG Jie, LIU Yang, ZHANG Jian^**, OU Jiang, CUI Ning-jie

(Key Laboratory of Ecological Forestry Engineering of Sichuan Province, Institute of Ecology & Forestry, Sichuan Agriculture University, Chengdu 611130, China)

Online:2014-06-10 Published:2014-06-10

摘要/Abstract

摘要： 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。

关键词: 模型评价, 风险分析, 福寿螺, 种群扩散, 适生性, 生物入侵

Abstract:

In order to investigate the distribution of precipitation and nitrogen, phosphorus characteristics by canopy interception of Pinus massoniana plantations, the rainfall, throughfall, stemflow and their nitrate (NO₃^-), ammonium (NH₄⁺) and total phosphorus (TP) concentrations were measured in 18 and 32 years old Pinus massoniana plantations at Laifu Town of Yibin City. The results showed that, according to the variations of monthly precipitation, the rain and dry seasons could be defined as from July to November and from January to April, respectively. Canopy interception and nitrogen, phosphorus concentrations were influenced by the rainfall class. Rainfall, interception of throughfall and stemflow were positively correlated with the rainfall class, and the interception in the dry season was less than in the rain season. The monthly average concentrations of TP, NO₃^--N, NH₄⁺-N in the dry season were significantly higher than in the rain season, and there were significant differences between months, whereas there were no significant differences in canopy interception of TN and TP concentrations between the two plantations. The result indicated that there were significant negative correlations between nitrogen and phosphorus concentrations with rainfall, throughfall and stemflow, and the nitrogen and phosphorus concentrations declined significantly with increasing the rainfall.

Key words: model evaluation, population dispersal, Pomacea canaliculata, risk analysis., biological invasion, adaptability

张捷,刘洋,张健**,欧江,崔宁洁. 马尾松人工林林冠层降雨再分配及其氮磷特征[J]. 生态学杂志.

ZHANG Jie, LIU Yang, ZHANG Jian**, OU Jiang, CUI Ning-jie. Rainfall redistribution by crown layer and variation characteristics of nitrogen and phosphorus in Pinus massoniana plantations.[J]. cje.

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