氮添加对毛竹林土壤磷组分的影响  

Effect of nitrogen addition on soil phosphorus fractions in the Phyllostachys edulis plantation

作　　者：王艺雄 张华锋 李全 张君波 王绍良 宋新章[1] WANG Yixiong;ZHANG Huafeng;LI Quan;ZHANG Junbo;WANG Shaoliang;SONG Xinzhang(State Key Laboratory of Subtropical Silviculture,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;Agroforestry Technology Extension Center in Lin’an District,Hangzhou 311300,Zhejiang,China)

机构地区：[1]浙江农林大学省部共建亚热带森林培育国家重点实验室,浙江杭州311300 [2]杭州市临安区农林技术推广中心,浙江杭州311300

出　　处：《浙江农林大学学报》2022年第4期695-704,共10页Journal of Zhejiang A&F University

基　　金：国家自然科学基金资助项目(31930075,32125027)。

摘　　要：【目的】了解氮输入对毛竹Phyllostachys edulis林土壤磷组分的影响及其转化机制,为实现毛竹林土壤磷的高效利用提供参考。【方法】以毛竹林为研究对象,设置4个氮添加梯度:0(对照)、30、60、90 kg·hm-2·a-1,利用生物有效磷分级方法测定表层土壤(0~20 cm)和深层土壤(20~40 cm)中的磷组分包括可溶性无机磷(CaCl2-P)、活性无机磷(Citrate-P)、酶水解有机磷(Enzyme-P)和可溶性活性无机磷质子(HCl-P)质量分数,探讨氮添加对毛竹林土壤磷组分的影响及其与土壤有效磷和理化性质的关系。【结果】与对照相比,氮添加显著(P<0.05)增加了所有土层土壤中的CaCl2-P质量分数(28.5%~63.3%)和深层土壤中Enzyme-P质量分数(16.3%~33.6%),而对深层土壤中HCl-P质量分数无显著影响(P>0.05)。低氮处理显著(P<0.05)增加了表层土壤中Citrate-P质量分数(43.5%),中高氮处理显著(P<0.05)增加了表层土壤中HCl-P质量分数(101.0%~155.2%)。在对照和氮添加处理中,表层土壤中的不同磷组分质量分数均显著(P<0.05)高于深层土壤。表层土壤中不同磷组分均与有效磷呈显著正相关(P<0.05),而深层土壤中仅Enzyme-P与有效磷呈显著正相关(P<0.01)。氮添加通过降低土壤pH,增加土壤有机碳、微生物生物量磷和酸性磷酸酶活性,促进了土壤不同磷组分向土壤有效磷的转化。【结论】氮添加提高了毛竹林土壤磷的生物有效性,为全球变化背景下毛竹林高效经营提供了科学参考。图5表3参43.[Objective] This paper aims to understand the effect of nitrogen(N) input on soil phosphorus(P)fraction and its transformation mechanism in moso bamboo(Phyllostachys edulis) plantation,so as to provide a reference for achieving efficient use of soil phosphorus in moso bamboo plantation.[Method] Moso bamboo plantation were used as research subjects,four N addition gradients(0,30,60,90 kg·hm-2·a-1) were set and the bioavailable P method was used to determine P fractions(CaCl2-P,Citrate-P,Enzyme-P and HCl-P) in the topsoil(0-20 cm) and subsoil(20-40 cm).The effect of N input on P fraction of moso bamboo plantation and its relationship with available P and soil physicochemical properties were explored.[Result] Compared to the control group,nitrogen addition significantly increased CaCl2-P content(28.5%-63.3%) in all soil layers and Enzyme-P content(16.3%-33.6%) in the subsoil,and had no significant effect on the HCl-P content in the subsoil.Low N treatment significantly increased the Citrate-P content(43.5%) in the topsoil and the medium to high N treatment significantly increased the HCl-P content in the topsoil(101.0%-155.2%).In both the control and N addition treatments,the different phosphorus fractions were significantly higher in the topsoil than in the subsoil.Each soil P fractions in the topsoil were significantly and positively correlated with available P(P<0.05).Enzyme-P in the subsoil was only significantly and positively correlated with available P(P<0.01).N addition accelerated the conversion of soil bioavailable P to available P by decreasing soil pH,increasing soil organic carbon,microbial biomass phosphorus,acid phosphatase activity.[Conclusion]The input of N increased the bioavailability of soil phosphorus in moso bamboo plantation,which could provide scientific reference for efficient management of moso bamboo plantation in the context of global change.[Ch,5 fig.3 tab.43 ref.]

关 键 词：氮添加 生物有效性磷 毛竹 土壤微生物 酸性磷酸酶 

分 类 号：S714[农业科学—林学]