Forest growing and agroforestry on a over wetland, China

中国湿地上的森林种植和农林业

基本信息

批准号：
10045061
负责人：
HAIBARA Kikuo
金额：
$ 1.54万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10045061/
关键词：
Jiangsu province China over wetland forests growing agroforestry poplar taxodium environmental stress 池スギ

项目摘要

Wetlands in China cover an area of approximately 63 millions ha, which ranks third in the world, and part of which has been exploited for forestry. The study area was located in Jangsu County, Jangus province, China. The study site of poplar and tax odium stands were divided into three groups respectively, a high, a middle, and a low water table site. The growth dynamics, biomass productivity, properties of soil, and characteristics of carbon and nitrogen mineralization in various study sites were studied. The principal results and conclusions are as follows.1. Effects of the water table on the biomass and nutrient contents of stands.A high water table seriously inhibited the growth in height, DBH, volume and biomass productivity of poplar and tax odium ; growth increased from lowest at the high water table site, to greatest at the low water table site. The biomass productivity of 10-year-old poplars situated in the high, middle, and lower water tables were 73, 162, 259 t/ha respectively. The biomass productivity of 17-year-old tax odium located in the high, middle, and low water tables were 56, 105, 163 t/ha, respectively.2. Physical and chemical properties of soil in the forest wetland.The air porosity of the soil decreased rapidly after the site was flooded. Exch, Ca, Mg and CEC was highest in the low water table and lowest in the high water table. A high water table caused a pH increase of 0.5 to 1.0 or more, but the organic matter content of the A0 horizon of the high water table site was higher than that of the lower water table site.The amount of inorganic nitrogen decreased rapidly in 0-20 cm soil depth as water table height increased. The NO_3-N was particularly low in the high water table sites because of denitrification. In September, methane emissions would increase greatly when the soil is flooded.

中国的湿地覆盖了大约6300万公顷的面积，在世界上排名第三，其中一部分被利用用于林业。研究区位于中国jangus省的张舒县。杨树和税收摊位的研究地点分别分为三组，一个高，中间和一个低地下水位地点。研究了各种研究地点的生长动力学，生物量生产率，土壤的特性以及碳和氮矿化的特征。主要结果和结论如下1。地下水位对林分的生物量和养分含量的影响。高地下水位严重抑制了杨树和税收量的高度，DBH，数量和生物量生产率的生长；从高地下水位地点的最低点增加到低地下水位地点的最大增长。位于高，中和下水表的10年杨树的生物量生产率分别为73、162、259吨/公顷。位于高水位，中间和低水位表中的17年历史税收的生物量生产率分别为56、105、163 t/ha.2。森林湿地中土壤的物理和化学特性。土壤被淹没后土壤的空气孔隙率迅速下降。远处的CA，CA，MG和CEC在低地下水位中最高，在高地下水位中最低。高地下水位导致pH值增加0.5至1.0或更多，但是高地下水位位点的A0地平线的有机物含量高于下水表位点的有机物含量。无机氮的量在0中迅速降低-20厘米的土壤深度随着地下水位的高度增加。由于反硝化，在高地下水位站点中NO_3-N特别低。 9月，当土壤被淹没时，甲烷排放将大大增加。