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《Journal of Arid Land Resources & Environment》 1989-02
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THE STUDY ON THE LITTER DECOMPOSITION RATES AND PROCESSES IN THE BROWN SOIL STEPPE ZONE OF INNER MONGOLIA

Huang de-hua;Chen zuo-zhong ;Suen chang-zai;Nashuendelige Institute of Plant Research, Acadima Sinica Siziwangqi Grassland Station, Inner Mongolia  
The litter decomposition rates and the processes of stipa breviflora and artemisia pectinata under the brown soil steppe zone in Inner Mongolia in this paper have been studied during 1985--1987.The results are as follows. 1.The decomposition of the plants can be devided into three stages: a.The high losing. weight stage: about 40% of the total weight decomposed during one year; b.The slower lesing weight stage: about 40--80% of the total weight decomposed during two to four years; c.The slowest losing weight stage: about 80% of the total weight decomposed durin? four to ten years. 2. During the process of the decomposition, each nutrient shows different characteristics. The speed of decomposition of raw fat is the highest during the first stage, only 20% of the total weight remained;the de- coinposition rates of protein and ash were 50%; the no--nitrogen lea- ching remained at 70% of its total weight; the decomposition process of cellulose is the slowest: about 80% remained.In a word, the decom- position rates of these nutrients during the first stage are different: raw fatash and proteinno--nitrogen leachcellulose. 3. The litter decamposition process in the desert steppe area is slower than that of in the temperate forest area. It will take about four years for the litter to be decomposed in the temperate forest region, while the similar process will take over ten years in the desert steppe area.
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