内蒙古民族大学学报（自然科学版）
內矇古民族大學學報（自然科學版）
내몽고민족대학학보（자연과학판）
JOURNAL OF INNER MONGOLIA UNIVERSITY FOR NATIONALITIES(NATURAL SCIENCES)
2014年
3期
306-309
,共4页
土壤呼吸%农牧交错带%土地利用方式
土壤呼吸%農牧交錯帶%土地利用方式
토양호흡%농목교착대%토지이용방식
Soil respiration%Ecotone%Land use types
农牧交错带地区土地利用方式多变，人为的改变土地利用方式会影响土壤释放CO2的速率.分别对新开垦农田、多年耕种农田、退耕还草草地、多年生草地4种利用类型的土壤温度、土壤有机碳含量、土壤呼吸速率进行监测和研究，结果表明：4种土地利用类型土壤呼吸速率的日变化图像呈单峰性曲线，其中草地平均呼吸速率最大，为0.85g·m-2·d-1.4种土地利用类型土壤温度与土壤呼吸速率呈正相关关系，其中新开垦农田变化明显，K值最高，达到0.045.从整个生长季来看，4种土地利用类型平均呼吸速率表现为新开农田＞草地＞还草草地＞农田，分别为0.97g·m-2·d-1、0.85g·m-2·d-1、0.77g·m-2·d-1和0.56g·m-2·d-1.0-10cm和10-20cm土层土壤有机碳含量大小关系与土壤呼吸速率基本吻合.试验表明不论对草地进行开垦还是对农田进行退耕还草都会增加土壤CO2的释放.
農牧交錯帶地區土地利用方式多變，人為的改變土地利用方式會影響土壤釋放CO2的速率.分彆對新開墾農田、多年耕種農田、退耕還草草地、多年生草地4種利用類型的土壤溫度、土壤有機碳含量、土壤呼吸速率進行鑑測和研究，結果錶明：4種土地利用類型土壤呼吸速率的日變化圖像呈單峰性麯線，其中草地平均呼吸速率最大，為0.85g·m-2·d-1.4種土地利用類型土壤溫度與土壤呼吸速率呈正相關關繫，其中新開墾農田變化明顯，K值最高，達到0.045.從整箇生長季來看，4種土地利用類型平均呼吸速率錶現為新開農田＞草地＞還草草地＞農田，分彆為0.97g·m-2·d-1、0.85g·m-2·d-1、0.77g·m-2·d-1和0.56g·m-2·d-1.0-10cm和10-20cm土層土壤有機碳含量大小關繫與土壤呼吸速率基本吻閤.試驗錶明不論對草地進行開墾還是對農田進行退耕還草都會增加土壤CO2的釋放.
농목교착대지구토지이용방식다변，인위적개변토지이용방식회영향토양석방CO2적속솔.분별대신개은농전、다년경충농전、퇴경환초초지、다년생초지4충이용류형적토양온도、토양유궤탄함량、토양호흡속솔진행감측화연구，결과표명：4충토지이용류형토양호흡속솔적일변화도상정단봉성곡선，기중초지평균호흡속솔최대，위0.85g·m-2·d-1.4충토지이용류형토양온도여토양호흡속솔정정상관관계，기중신개은농전변화명현，K치최고，체도0.045.종정개생장계래간，4충토지이용류형평균호흡속솔표현위신개농전＞초지＞환초초지＞농전，분별위0.97g·m-2·d-1、0.85g·m-2·d-1、0.77g·m-2·d-1화0.56g·m-2·d-1.0-10cm화10-20cm토층토양유궤탄함량대소관계여토양호흡속솔기본문합.시험표명불론대초지진행개은환시대농전진행퇴경환초도회증가토양CO2적석방.
The land use patterns was changeable in the agro-pastoral ecotone , and Artificial changes of land use pat-terns could affect the rate of CO2 released from the soil. the soil temporature, soil organic carbon content and soil respi-ration rate of four different soil type(new farmland, operated farmland of years, the grassland which has returned farm-land to grassland and the grassland growed for many years)were monitored and contrasted ,The result showed that diur-nal variation images of soil respiration rate of four different soil type was a single apex, and average respiration quantity of grassland reached the maximum for 0.85g·m-2·d-1.With the increase in soil temperature, soil respiration rate of four kinds of land-use types also immediately increase, Soil temperature and soil respiration rate was positively correlated for four different soil type, Among these,the newly opened farmland changed significantly, K value up to 0.045.From the point of view throughout the growing season, average soil respiration rate of different soil type were:farmland>grassland>also hastily>farmland,andrespectively0.97g·m-2·d-1,0.85g·m-2·d-1,0.77g·m-2·d-1 and 0.56g·m-2·d-1. The change trends of soil organic carbon content in 0-10cm and 10-20cm soil layers was similar to soil respiration rate. which showed it could increase the soil CO2 release by returned farmland to grassland and the grassland growed for many years.
