森林資源清查資料論文：金溝嶺林場(chǎng)森林地上生物量時(shí)空動(dòng)態(tài)分析與預(yù)測(cè)-展示頁(yè)
2025-04-13 23:31本頁(yè)面
【正文】 goes on ,the ratio of biomass of Abies nephrolepis forest, Larch forest, mixed broadleafconifer forest, conifer mixed forest are decreasing, instead broadleaf mixed forest and other precious tree species such as Pinus koraiensis forest , Picea jazoensis forest are increasing. The ratio of biomass of nature forest to biomass of plantation in last 20 years is 9:1. The trend of biomass growth rate in nature forest is decreasing, instead that plantation has an increasing biomass growth trend as the time moves on. The undesirable phenomenon of the proportion of age structure that the proportion of halfmature forest is larger than mature forest is better as time goes on. Commercial forest is a forest type which has the biggest biomass proportion in all kinds of forest categories and it bees smaller as the time goes on and the biomass proportions of other forest categories are increasing. Unlike the distribution of biomass density at 100150 t/ hm2 and 150200 t/ hm2 ,the distribution of biomass density at 050t/ hm2 and 200400 t/ hm2 shows
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