阿什河流域6种人工林叶片-凋落物-土壤系统的养分分配与利用格局  

Nutrient distribution and utilization patterns in six plantations leaf-litter-soil system in the Ashi River Basin

作　　者：吴慧 王树力[1] 郝玉琢 周磊 WU Hui;WANG Shuli;HAO Yuzhuo;ZHOU Lei(College of Forestry,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林学院,黑龙江哈尔滨150040

出　　处：《南京林业大学学报（自然科学版）》2020年第5期100-108,共9页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家重点研发计划(2017YFD0601103);黑龙江省省级财政林业科研专项项目(201522)。

摘　　要：【目的】分别从人工林叶片、凋落物、土壤养分含量及化学计量比的差异,叶片-凋落物养分重吸收的差异,土壤有效养分及其活化的差异等方面,探究黑龙江阿什河流域6种人工林生态系统的养分吸收与利用策略,明确人工针叶林和阔叶林间以及不同树种间叶片-凋落物-土壤系统养分分配格局的差异,从养分优化利用和养分资源合理配置的角度考虑,推断适宜的互补树种,为流域森林景观的恢复和人工林的经营提供依据。【方法】以东北林业大学实验林场森林培育实验站次生林带状皆伐后营造的位置相近、立地条件基本一致的29年生红松、长白落叶松、红皮云杉、水曲柳、黄檗、胡桃楸人工林为研究对象,通过野外调查取样,室内使用碳氮分析仪测定叶片、凋落物、土壤C含量,使用凯氏定氮仪测定叶片和凋落物的N含量,硫酸-高氯酸消化-钼锑抗比色法测定叶片和凋落物的P含量,连续流动分析仪测定土壤的N含量、铵态氮(NH4+-N)及硝态氮(NO3--N)含量,硫酸-高氯酸消化-钼锑抗比色法测定土壤的P含量,HCl-H2SO4浸提法测定土壤的有效磷含量。运用生态化学计量学的研究方法,分析各林分叶片-凋落物-土壤系统的养分含量及其生态化学计量特征,确定各凋落物营养的重吸收及土壤有效养分的供应特征。【结果】(1)针叶林叶片P含量(1.55 g/kg)显著低于阔叶林叶片P含量(2.02g/kg)(P<0.05,F=16.92,df=1)。针叶林土壤C、P含量(47.75、1.17 g/kg)显著低于阔叶林土壤C、P含量(76.35、1.47 g/kg)(P<0.05,FC含量=75.15,FP含量=9.91,df=1)。6种林分中,水曲柳林叶片的N含量(19.64g/kg)(P<0.05,F=5.26,df=5)、凋落物C、N、P含量(P<0.05,FC含量=2.34,FN含量=1.60,FP含量=6.74,df=5)和土壤的C、N、P含量(P<0.05,FC含量=154.84,FN含量=14.21,FP含量=53.55,df=5)均相对较高。红皮云杉林叶片P含量(1.30 g/kg)(P<0.05,F=36.71,df=5),长白落叶松林凋落物C含量(P【Objective】This study aimed to provide a theoretical basis for the recovery of the forest landscape and optimalmanagement of plantations in the Ashi River Basin.The differences in leaf-litter-soil nutrient content and stoichiometricratio, leaf-litter-nutrient resorption and soil available nutrients and their activation were investigated to explore thenutrient absorption and utilization strategies in plantations of six tree species.Differences in the nutrient distribution pat-terns between plantations of coniferous and broad-leaved species were also investigated, from the point of rational alloca-tion and optimal utilization of nutrient resources, complementary tree species were inferred. 【 Method】 The study wasconducted at the Forest Cultivation Experiment Station of the Northeast Forestry University in plantations located onsecondary forest strip clear cutting land with the same site conditions.The study plantations were 29 years old and con-tained the following six species:Pinus koraiensis,Larix olgensis,Picea koraiensis,Fraxinus mandshurica,Phellodendron amurenseandJuglans mandshurica.Applying the research method of ecological stoichiometry, the nutrientcontent and stoichiometric characteristics of the leaf-litter-soil system of each plantation were analyzed, and the nutrientresorption of the litter and the supply characteristics of soil available nutrients were confirmed.This was accomplishedthrough field survey sampling and laboratory analysis.A Carbon and nitrogen analyzer was used to determine the carbon(C) content in leaves, litter, and soil and a Kjeldahl instrument was used to determine the nitrogen(N) content inleaves and litter.The soil N content as ammonium nitrogen(NH4+-N) and nitrate nitrogen(NO3--N) was determined byusing a continuous flow analyzer.Phosphorus(P) content was determined by sulfuric-perchloric acid digestion and mo-lybdenum-antimony colorimetry.The soil P content was determined by sulfuric-perchloric acid digestion andmolybdenum-antimony colorimetry.Soil available P was deter

关 键 词：人工林 叶片 凋落物 土壤 养分格局 重吸收率 黑龙江阿什河流域 

分 类 号：S714.2[农业科学—林学] A[哲学宗教—马克思主义哲学]