摘要
为研究凋落物对南方粘性黄壤土的改良效应,以杂交构树等4种树种不同类型的凋落物为供试材料,以仪征市新集镇土样为供试土壤,采用网袋分解法对凋落物分解及其养分释放特征进行研究;采用室内培养法研究凋落物分解对土壤理化性质的影响。结果表明,有机质含量以香樟枝中最高(826.8 mg/g),全氮(N)含量以桂花树枝中最高(42.54 mg/g),全磷(P)含量以桂花树枝最高(8.04 mg/g),全钾(K)含量以桂花树枝中最高(93.72 mg/g)。不同凋落物中,分解速率最快的为杂交构树叶片(1 a),分解最慢的香樟根系(2.98 a)。分解过程中的C、N、P和K均表现为释放状态。不同树种间比较,N和C的释放速率差异较大,而P和K差异不显著。相关性分析表明,同类型凋落物中含有较高的N含量有利于分解,而C/N高对凋落物分解不利。本研究还表明凋落物添加可以降低土壤pH值,同时也能够显著增加土壤有机质、全N、碱解N、全P、速效P、全K和速效K的含量。此外,凋落物的添加可以显著降低土壤容重、增加土壤总孔隙度和田间持水率。杂交构树叶、根和茎分解速率在不同树种间对比中最快,因此杂交构树凋落物可以更快参与土壤团聚体形成并为土壤供给养分,适宜作为改良植被应用于南方黏性黄壤土的改良当中。
To study the improvement effect of litter on the cohesive yellow loam soil in southern China,different types of litter from four tree species,including hybrid Broussonetia papyrifera,were used as test materials.A soil sample from Xinji Town,Yizheng City was used as the test soil;The decomposition and nutrient release characteristics of litter were studied using the mesh bag decomposition method;The indoor cultivation method was used to study the effect of litter decomposition on soil physicochemical properties.The results showed that the highest organic matter content was found in the branches of Cinnamomum camphora(826.8 mg/g),the highest total nitrogen(N)content was found in the branches of Osmanthus(42.54 mg/g),the highest total phosphorus(P)content was found in the branches of Osmanthus(8.04 mg/g),and the highest total potassium(K)content was found in the branches of Osmanthus(93.72 mg/g).Among different types of litter,the fastest decomposition rate was seen in the leaves of hybrid B.papyrifera(1 a),while the slowest decomposition rate was seen in the roots of C.camphora(2.98 a).During the decomposition process,carbon(C),N,P,and K all exhibited release states.Comparison between different tree species,the release rates of N and C differed significantly,while the differences in P and K were not significant.The correlation analysis showed that a higher N content in the same type of litter was beneficial for decomposition,while a higher C/N ratio was detrimental to litter decomposition.This study also showed that adding litter could reduce soil pH,while significantly increasing the content of organic matter,total N,alkali-hydrolyzable N,total P,available P,total K,and available K in the soil.Additionally,the addition of litter could significantly reduce soil bulk density,increase total soil porosity and field water holding capacity.The decomposition rates of leaves,roots,and stems of hybrid Broussonetia were the fastest among different tree species.Therefore,the litter of hybrid Broussonetia could participate in
作者
王金山
庞立欣
张爱军
杨晓楠
梁欣
张海涛
WANG Jinshan;PANG Lixin;ZHANG Aijun;YANG Xiaonan;LIANG Xin;ZHANG Haitao(College of Resources and Environmental Sciences,Hebei Agricultural University,Baoding 071001,China;Scientific Research Academy,Hebei Agricultural University,Baoding 071001,China;National Engineering Research Center for Agriculture Northern Mountainous Areas,Baoding 071001,China;Baoding Branch of Central Agricultural Broadcasting School,Baoding 071001,China;College of Horticulture,Hebei Agricultural University,Baoding 071001,China)
出处
《林业与生态科学》
2024年第2期197-206,232,共11页
Forestry and Ecological Sciences
基金
河北省重点研发计划项目(20324202D)。
关键词
黄壤土
杂交构树
凋落物
土壤改良
yellow loam soil
hybrid Broussonetia papyrifera
litter
soil improvement
