杉木幼苗土壤磷组分对氮磷添加的响应  

Response of soil phosphorus fractions in Chinese fir seedlings to nitrogen and phosphorus addition

作　　者：杨博涵 哀建国[1] 董达 邹鹏程 YANG Bohan;AI Jianguo;DONG Da;ZOU Pengcheng(College of Forestry and Biotechnology,Zhejiang A&F University,Zhejiang Lin'an 311300,China;College of Environmental and Resource Sciences,Zhejiang A&F University,Zhejiang Lin'an 311300,China)

机构地区：[1]浙江农林大学林业与生物技术学院,浙江临安311300 [2]浙江农林大学环境与资源学院,浙江临安311300

出　　处：《南方林业科学》2025年第1期27-32,共6页South China Forestry Science

基　　金：“十三五”国家重点研发计划项目(2016YFD0600201)。

摘　　要：【目的】探究亚热带地区杉木幼苗土壤磷组分对氮磷添加的响应。【方法】以2年生杉木幼苗为研究对象,基于不同水平氮、磷及复合添加试验,测定杉木幼苗土壤磷组分及磷转化酶活性。【结果】单独施氮显著提高了土壤中等活性磷的含量,随着施氮浓度升高,土壤中Conc.HCl-Pi的含量显著降低(P<0.05);磷处理及氮磷复合处理下的土壤Resin-P(含量为25.73~27.08 mg/kg)、NaHCO_(3)-Pi(含量为79.91~83.95 mg/kg)及NaOH-Pi(含量为81.71~90.39 mg/kg)显著高于CK(P<0.05),而Residual-P(含量为27.49~30.58 mg/kg)在各处理间无显著变化;磷处理和氮磷复合处理后的土壤植酸酶活性(含量为31.50~34.52 mg/(kg·h),显著高于CK和单独氮处理(P<0.05),但磷酸酶活性(含量为6.14~6.66 mg/(kg·h)在各处理间均无显著变化。【结论】氮磷复合添加可显著提高土壤中不同活性磷的含量,且随着施氮浓度的升高,土壤中难利用的磷向更高活性磷转化。氮磷添加量在120 kg/(hm^(2)·a)及20 mg/kg处理后的土壤养分条件更有助于杉木幼苗生长。【Objective】Exploring the response of soil phosphorus fractions in subtropical Cunninghamia lanceolata seedlings to nitrogen and phosphorus additions.【Method】A two-year-old C.lanceolata seedling was used as the research object.Based on different levels of nitrogen,phosphorus,and combined addition experiments,the soil physicochemical properties,soil phosphorus fractions,and phosphorus-transforming enzyme activities of C.lanceolata seedlings were determined.【Result】The application of nitrogen fertilizer alone significantly increased the content of moderately active phosphorus in the soil.With the increase of nitrogen application rate,the content of Conc.HCl-Pi significantly decreased(P<0.05).The soil Resin-P(contents were from 25.73 to 27.08 mg/kg),NaHCO_(3)-Pi(contents were from 79.91 to 83.95 mg/kg),and NaOH-Pi(contents were from81.71 to 90.39 mg/kg)under phosphorus treatment and combined nitrogen and phosphorus treatment were significantly higher than those of CK(P<0.05).However,the Residual-P content(from 27.49 to 30.58 mg/kg)showed no significant changes among treatments.The soil phytase contents after phosphorus treatment and combined nitrogen and phosphorus treatment were 31.50to 34.52 mg/(kg·h),which were significantly higher than those of CK(P<0.05).But phosphatase(contents were from 6.14 to6.66 mg/(kg·h))showed no significant changes among treatments.【Conclusion】Combined nitrogen and phosphorus addition could significantly increase the content of different labile phosphorus in the soil.And with the increase of nitrogen application concentration,the difficult to utilize phosphorus in the soil was transformed into higher activity phosphorus.The soil nutrient conditions after nitrogen and phosphorus additions of 120 kg/(hm^(2)·a)and 20 mg/kg,respectively,were more conducive to the growth of C.lanceolata seedlings.

关 键 词：氮磷添加 杉木幼苗 磷组分 土壤酶 

分 类 号：S791.27[农业科学—林木遗传育种]