Research on biomass and productivity of conversion cropland to forest in Datong County of Qinghai Province
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 were 29. 5 t/hm2 and 9. 36 t/(hm2. a), and the range was pattern D (Hippophae rhamnoides ssp. sinensis ) > pattern C (Populus cathayana + Lycium barbarum ) > pattern E ( Caragana ko-rshinskii ) > pattern B ( Medicago sativa ) > 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 ( Larix . 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.
conversion cropland to forestbiomassproductivityDatong County of Qinghai Province
国家科技期刊平台
NSTL
万方数据
维普
