本文選題：次生林 + 土壤有機碳(SOC)　； 參考：《南方農(nóng)業(yè)學報》2017年04期

【摘要】：【目的】探討湖南莽山國家級自然保護區(qū)三類次生林土壤有機碳(SOC)分布特征與土壤物理性質(zhì)的關(guān)系,為該地區(qū)森林土壤碳儲量的準確計量及森林土壤固碳增匯提供參考依據(jù)�！痉椒ā吭诤０�1230~1300 m區(qū)域內(nèi)的杉木、粵松林和竹林內(nèi)設(shè)9個固定標準地,采集不同層次土壤樣品32個,測定其SOC、土壤容重及田間持水量,運用方差分析、相關(guān)分析及回歸分析法研究不同植被類型SOC分布特征及其與土壤容重和田間持水量間的關(guān)系�！窘Y(jié)果】杉、松、竹三類林地不同土層SOC含量存在顯著差異(P0.05,下同),隨土壤深度增加呈遞減趨勢;不同林分變化幅度差異不同,且各土層間的差異達顯著水平。三類林地0~40 cm土層SOC存貯有機碳在整個土層所占比重不同,分別為77.7%、77.1%和85.9%。經(jīng)回歸分析發(fā)現(xiàn),杉、松、竹三類林地SOC和土壤容重擬合值R分別為0.632、0.727和0.615,杉木林SOC含量與土壤容重呈極顯著相關(guān)(P0.01,下同);三類林地SOC含量與田間持水率均呈極顯著或顯著正相關(guān)。方差分析結(jié)果表明,黏粒、粉粒、砂粒含量在同一土層中的三類林地間存在極顯著差異;黏粒、粉粒、砂粒含量與SOC含量相關(guān)不顯著(P0.05),而砂粒與黏粒、粉粒存在極顯著負相關(guān)。杉、松、竹三類林地砂粒含量在土壤垂直剖面各層均高于黏粒、粉粒含量。【結(jié)論】莽山不同次生林SOC與土壤物理性質(zhì)密切相關(guān),土壤容重、田間持水量、土壤機械組成等物理性質(zhì)可作為營林和增加森林土壤碳匯的參考指標。
[Abstract]:[objective] to study the relationship between soil organic carbon (SOC) distribution characteristics and soil physical properties in three types of secondary forest in Gansshan National Nature Reserve of Hunan Province. This paper provides a reference for the accurate measurement of forest soil carbon storage and the increase of forest soil carbon sequestration. [methods] A total of 32 soil samples of different levels were collected from 9 fixed standard plots of Chinese fir, Guangdong pine forest and bamboo forest in the area of 1230 ~ 1300m above sea level. SOC, soil bulk density and field water capacity were measured. The SOC distribution characteristics of different vegetation types and their relationship with soil bulk density and field water capacity were studied by means of variance analysis, correlation analysis and regression analysis. There was significant difference in SOC content in different soil layers of three types of woodlands (P 0.05, P 0.05), and the content of SOC decreased with the increase of soil depth, and the variation range of different stands was different, and the differences among different soil layers reached a significant level. The proportion of SOC stored in the soil layer of 0 ~ 40 cm in three types of woodland is different, which is 77.7% and 85.9%, respectively. By regression analysis, we found that the fir, pine, The fitting values of SOC and soil bulk density in three types of woodland were 0.6320.727 and 0.615, respectively. The SOC content of Chinese fir forest was significantly correlated with soil bulk density (P0.01), and the SOC content of three kinds of woodland was significantly or positively correlated with the field water holding rate. The results of variance analysis showed that the contents of clay, silt and sand were significantly different among the three types of woodland in the same soil layer, and the content of clay, silt and sand had no significant correlation with SOC content (P0.05N), while the content of sand was negatively correlated with clay and silt. The sand content in soil vertical profile was higher than that of clay in soil vertical profile. [conclusion] SOC of different secondary forest in mountain area was closely related to soil physical properties, soil bulk density and field water holding capacity. Physical properties such as soil mechanical composition can be used as a reference index for forest forestry and increasing forest soil carbon sinks.
【作者單位】： 中南林業(yè)科技大學經(jīng)濟林培育與保護省部共建教育部重點實驗室;經(jīng)濟林育種與栽培國家林業(yè)局重點實驗室;經(jīng)濟林培育與利用湖南省2011協(xié)同創(chuàng)新中心;
【基金】：科技部科技基礎(chǔ)性工作專項項目(2014FY120700) 國家林業(yè)公益性行業(yè)專項項目(201104008)
【分類號】：S714.2
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本文編號：2034112