东北林业大学学报
東北林業大學學報
동북임업대학학보
JOURNAL OF NORTHEAST FORESTRY UNIVERSITY
2014年
9期
77-82
,共6页
大兴安岭%低质林%土壤呼吸日变化%土壤温度%土壤湿度
大興安嶺%低質林%土壤呼吸日變化%土壤溫度%土壤濕度
대흥안령%저질림%토양호흡일변화%토양온도%토양습도
Daxing ’ an Mountains%Low-quality forest%Soil respiration diurnal variation%Soil temperature%Soil moisture
以大兴安岭地区针阔混交低质林、山杨低质林、蒙古栎低质林、白桦低质林、阔叶混交低质林为研究对象，采用LI-8150多通道土壤呼吸自动测量系统测定了不同类型低质林土壤呼吸速率的日变化，并测定了观测点的土壤温度、湿度、理化性质以及枯落物。结果表明：不同类型低质林土壤呼吸速率差异显著，土壤呼吸速率白天均高于夜晚，1 d中最高值出现在12：00-14：00，最低值出现在23：00-03：00，土壤呼吸速率与土壤温度的关系适合指数模型（R2为0．73～0．82），土壤呼吸速率与土壤温度和土壤湿度呈显著的二次曲线关系（R2为0．61～0．85），土壤温湿度双因子复合模型能更好解释不同类型低质林土壤呼吸速率的差异。土壤呼吸速率与土壤总孔隙度、有机质质量分数存在显著的正相关性，与土壤pH值、氮质量分数及半分解枯落物蓄积量相关性也较高。
以大興安嶺地區針闊混交低質林、山楊低質林、矇古櫟低質林、白樺低質林、闊葉混交低質林為研究對象，採用LI-8150多通道土壤呼吸自動測量繫統測定瞭不同類型低質林土壤呼吸速率的日變化，併測定瞭觀測點的土壤溫度、濕度、理化性質以及枯落物。結果錶明：不同類型低質林土壤呼吸速率差異顯著，土壤呼吸速率白天均高于夜晚，1 d中最高值齣現在12：00-14：00，最低值齣現在23：00-03：00，土壤呼吸速率與土壤溫度的關繫適閤指數模型（R2為0．73～0．82），土壤呼吸速率與土壤溫度和土壤濕度呈顯著的二次麯線關繫（R2為0．61～0．85），土壤溫濕度雙因子複閤模型能更好解釋不同類型低質林土壤呼吸速率的差異。土壤呼吸速率與土壤總孔隙度、有機質質量分數存在顯著的正相關性，與土壤pH值、氮質量分數及半分解枯落物蓄積量相關性也較高。
이대흥안령지구침활혼교저질림、산양저질림、몽고력저질림、백화저질림、활협혼교저질림위연구대상，채용LI-8150다통도토양호흡자동측량계통측정료불동류형저질림토양호흡속솔적일변화，병측정료관측점적토양온도、습도、이화성질이급고락물。결과표명：불동류형저질림토양호흡속솔차이현저，토양호흡속솔백천균고우야만，1 d중최고치출현재12：00-14：00，최저치출현재23：00-03：00，토양호흡속솔여토양온도적관계괄합지수모형（R2위0．73～0．82），토양호흡속솔여토양온도화토양습도정현저적이차곡선관계（R2위0．61～0．85），토양온습도쌍인자복합모형능경호해석불동류형저질림토양호흡속솔적차이。토양호흡속솔여토양총공극도、유궤질질량분수존재현저적정상관성，여토양pH치、담질량분수급반분해고락물축적량상관성야교고。
We measured the change of soil respiration rate by using soil respiration measurement LI-8150, and the soil tempera-ture, soil moisture, soil physical and chemical properties, litter in five typical low-quality forest stands including mixed co-nifer and broadleaved forest, Populus davidiana forest, Quercus mongolica forest, Betula platyphylla forest and broadleaved mixed forest in Daxing’ an Mountains.The soil respiration rates were significantly different between different types of low-quality forest.The soil respiration rates during the day were higher than that in the night, the highest rate occurred from 12:00 to 14:00, and the lowest rate occurred between 23:00 to 3:00.Exponential model was suitable to the relation be-tween soil respiration rate and soil temperature ( with R2 of 0.73-0.82) , soil respiration rate and soil moisture was quadrat-ic curve relationship ( with R of 0.61-0.85) , soil temperature and moisture complex double factor model could better ex-plain the differences of different types of low-quality forest soil respiration rate.There were significant positive correlations between soil respiration rate and soil total porosity, organic matter content, and there were higher correlations between soil respiration rate and soil pH, nitrogen content, and amount of semi-decomposed litter.
