| Research on biomass and productivity of conversion cropland to forest in Datong County of Qinghai Province |
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| DOI：10.7606/j.issn.1000-7601.2007.01.05 |
| Key Words: conversion cropland to forest biomass productivity Datong County of Qinghai Province |
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| Abstract: |
| The biomass and productivity of conversion cropland to forest in Datong County of Qinghai Province were analyzed in the paper．The result indicated that in the shallow —mountainous area the total biomass and the total productivity of the community assumed connected remarkably with the existent mass of litter layer of forestland．The total biomass and the total capacity of model D （ Hippophae rhamnoides ssp．sinensis） were the biggest which were29．5t／hm2 and 9．36t／（hm2．a） and the range was pattern D （ Hippophae rhamnoides ssp．sinensis） ＞ pattern C （Populus cathayana＋Lycium barbarum） ＞ pattern E （Caragana korshinskii）＞ pattern B （ Medicago sativ a） ＞ pattern A （Paeonia veitchii）．In the high-mountainous area the total biomass and the total capacity were decided mainly by the biomass of tree layer pattern F was the biggest and arranges as pattern F （Picea crassifolia） ＞ pattern G （L arix．principis rupprechii） ＞ pattern J （Populus cathayana＋ Hippophae rhamnoides ssp．sinensis） ＞ pattern K （Picea crassifolia＋ Hippophae rhamnoides ssp．sinensis） ＞ pattern H （Betula latyphylla＋Picea crassifolia）．At the same time the level productivity assumed a remarkable inverse correlation with the sum of productivity of the bush level and the field layer．This explained that in high-mountainous area the tree layer has the obvious inhibitory action to the bush and herb under it because canopy density of forest was increased along with the years of conversion cropland to forest. |