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薛立,冯慧芳,刘落鱼.外源性NP添加及林分密度对大叶相思林地土壤酶活性的影响.生态学报,2020,(14).http://dx.doi.org/10.5846/stxb201910162163  
外源性NP添加及林分密度对大叶相思林地土壤酶活性的影响
Effects of nitrogen and phosphorus addition on soil enzyme activities in an Acacia auriculaeformis stands under different planting densities
投稿时间:2019-10-16  修订日期:2020-03-21
DOI: " target="_blank" title="转向doi官网查询:http://dx.doi.org">10.5846/stxb201910162163
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基金项目中央财政林业科技推广示范项目(2015-GDTK-07)
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  forxue@scau.edu.cn 
   
   
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摘要:
本文研究了林分密度和外源性NP添加对大叶相思林地土壤酶活性的影响。以大叶相思(Acacia auriculaeformis)人工林为试验材料,选择氯化铵(NH4Cl)和二水合磷酸二氢钠(NaH2PO4?2H2O)作为N肥和P肥,氮磷处理设置4 个水平,即对照、施N、施P和施N+P;种植密度设置低密度(1667株?hm-2)、中密度(2500株?hm-2)、较高密度(4444株?hm-2)和高密度(10000株?hm-2)4个水平。测定各处理土壤脲酶、磷酸酶和过氧化氢酶,分析林分密度和NP添加对大叶相思林地土壤酶活性的影响。研究结果表明:N添加对各林分密度下的土壤脲酶活性和过氧化氢酶均有抑制作用,施P显著提高了过氧化氢酶活性和高密度林分大叶相思林地的土壤脲酶活性,却降低了低密度林分的土壤脲酶活性;土壤磷酸酶活性在施P和N+P两种处理下显著小于对照和施N处理;土壤脲酶、磷酸酶以及对照和施P处理下的过氧化氢酶活性均随着林分密度的升高呈现上升的趋势,而土壤过氧化氢酶活性在施N和N+P后随着林分密度的减小而升高。林分密度和外源性NP添加的交互作用对三种土壤酶的活性均有显著影响。
Abstract:
In this paper, the effects of N and P addition on soil enzyme activities were studied in Acacia auriculaeformis stands under different planting densities. NH4Cl and NaH2PO4?2H2O were selected as N and P fertilizers, respectively, with four treatments (control, N, P, and N+P), and A. auriculaeformis plantations were planted at low density (1667 trees?hm-2), medium density (2500 trees?hm-2), relatively high density (4444 trees?hm-2) and high density (10000 trees?hm-2). The results showed that the soil urease activity and catalase activity increased in the A. auriculaeformis stands after N addition. P addition significantly increased the soil urease activity under high density stand, but reduced urease activity under low density stand compared to those of the control treatment. The activity of soil phosphoric enzyme under N and N+P treatments was significantly smaller than the control and N treatment. The soil urease and phosphoric enzyme activities were increased with increasing forest density, while soil catalase activity increased with decreasing stand density under N and N+P treatments, but reduced under the control and P treatment. The interactive effects of different stand densities and NP additions on the soil catalase, urease and phosphoric enzyme activities were significant in the A. auriculaeformis stands.

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