The standing stock of litter fall in forest park was 4 317.5 t,and the amount of organic C,N,P,K,Ca and Mg contents were 4 643.51 kg/hm2,108.04 kg/hm2,10.72 kg/hm2,48.26 kg/hm2,156.75 kg/hm2 and 23.96 kg/hm2,respectively,which showed that the litter fall of the forest park was an important nutrient storeroom.
The ecological water requirement of forests is defined as the water resources used to maintain and improve the natural balance of forest ecosystems, which can be expressed by evapotranspiration of trees during the growing season.
With geographic information system (GIS), the ecological water requirement for forests in the Jinghe watershed, western China was estimated.
The results revealed that the minimum and suitable ecological water requirements of the forests in the Jinghe watershed were approximately 204×107 and 340×107 m3, respectively.
Although the RENIs of plantations in rehabilitated fields are a little lower than those of natural forests, they are higher than those of cultivated crops.
Comparative Analysis of Plant Diversity of Pinus tabulaeformis Forests in Ten Regions of Beijing Mountainous Areas
According to the international methods of pest risk analysis and urban forestry characteristics in Beijing, a quantitative risk assessment system in Beijing for three primary non-indigenous pests was proposed.
Eco-emigration and the return of marginal agricultural land to forestry can be practiced.
This study was conducted at Maoershan Forest Research Station (45°21'-45°25'N, 127°30'-127°34'E) owned by Northeast Forestry University in Harbin, northeast China.
The Maoershan forestry centre is situated in the Zhangguangcai Mountain of the Changbai mountain range.
Following the principles of runoff-collecting forestry and applying the forest structure investigation results, the authors developed a formula to calculate appropriate density for forests on the basis of different diameters at breast height (DBH).
Nitrate has been recognized as the dominant mineral nitrogen form in most agricultural soils and the main nitrogen source for crops, but it is not usually the case in forest ecosystems.
Fine root lifespan and turnover play an important role in carbon allocation and nutrient cycling in forest ecosystems.
Soil properties in forest gaps and under canopy in broad-leaved Pinus koraiensis forests in Changbai Mountainous Region, China
Results showed that compared with farmland watersheds, runoff generation time in forest watersheds was delayed remarkably, and peak flow was reduced greatly, which indicates that vegetation played an important role in holding and absorbing rainfall.
The two forests differ in forest humus layer; it is deep in the Ailao forest while little is present in the Xishuangbanna forest.