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OALib Journal期刊
ISSN: 2333-9721
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长江上游马尾松人工林土壤铵态氮和硝态氮对采伐林窗的初期响应
DOI: 10.3724/SP.J.1145.2014.03023, PP. 147-154
Keywords: 林窗大小,低效人工林,生长季,铵态氮,硝态氮,土壤微生物,单因素试验
Abstract:
为了解采伐林窗对马尾松人工林土壤有效氮的影响，在长江上游低山丘陵地区，选取人为采伐形成的马尾松（pinusmassoniana）人工林7种不同大小林窗（g1-g7，面积分别为100m2、225m2、400m2、625m2、900m2、1225m2、1600m2）以及林下对照为研究对象，研究林窗中央和边缘铵态氮（nh4+-n）和硝态氮（no3--n）的生长季变化.结果显示：林窗形成初期，其大小仅对土壤nh4+-n有显著影响，季节变化仅对no3--n有显著影响，但两者对土壤nh4+-n、no3--n均有显著的交互作用，林窗中央和边缘间土壤nh4+-n、no3--n差异均不显著.具体为：（1）林窗土壤nh4+-n含量为4.30-11.99mgkg-1，no3--n含量为2.57-10.81mgkg-1；不同大小林窗间nh4+-n、no3--n仅在生长季中期总体随林窗增大先升后降；总的来看，面积为100-400m2的林窗土壤nh4+-n、no3--n较高.（2）在季节动态上，nh4+-n在生长季中期较低；no3--n为中高末低.同时，生长季初期和末期nh4+-n高于no3--n，而中期却相反.（3）较之林下，生长初期及末期部分林窗土壤nh4+-n、no3--n降低.（4）相关分析表明，nh4+-n与微生物生物量氮（mbn）极显著正相关，no3--n与土壤温度、mbn和有机质均极显著正相关，但土壤含水量对nh4+-n、no3--n均无显著影响.因此，林窗对土壤温度及微生物活性的改变可能是影响土壤有效氮含量的主要因素.
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