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采用野外原位试验模拟氮(N)沉降,研究了其对鼎湖山马尾松林、混交林和季风林3种森林类型土壤酸性磷酸单酯酶活性(APA)和有效磷(AP)含量的影响.在季风林中设置对照(0 kg N.hm-2.a-1)、低N(50 kg N.hm-2.a-1)、中N(100 kg N.hm-2.a-1)和高N(150 kg N.hm-2.a-1)处理,在马尾松林和混交林中只设置对照、低N和中N处理.结果表明:随着土层加深,土壤APA和AP含量降低.土壤APA在季风林中最高,而AP含量在3种林型中没有显著差异.N沉降增加对土壤APA的作用与林型有关.季风林中适度N沉降可使APA升高,且低N处理的APA(19.52μmol.g-1.h-1)最高;马尾松林和混交林中,中N处理的APA最高,分别为12.74和11.02μmol.g-1.h-1.3种林型的AP含量均在低N处理下最高,但各N处理之间的差异并不显著.土壤APA与AP含量之间呈显著正相关关系.
In situ field experiments were conducted to simulate nitrogen (N) deposition and their effects on soil APS and AP contents in Pinus massoniana forest, mixed forest and monsoon forest in Dinghushan were studied. In the monsoon forest, the control (0 kg N · hm -2 · a -1), low N (50 kg N · hm -2 · a -1), medium N (100 kg N · hm -2 · a -1 ) And high N (150 kg N · hm-2.a-1), only the control, low N and medium N treatments were set up in Pinus massoniana and mixed forest.The results showed that with the deepening of soil layers, the soil APA and AP APA was the highest in monsoon forest, while AP content was not significantly different among the three forest types.The effect of N deposition on soil APA was related to forest type.The moderate N deposition in monsoon forest could increase APA The lowest APA (19.52μmol.g-1.h-1) was the highest in the treatments of N and the highest APA in the Pinus massoniana and mixed forests was 12.74 and 11.02μmol.g-1.h-1.3 Of AP content were the highest under the low N treatment, but there was no significant difference between the N treatments.The soil APA and AP content had a significant positive correlation.