Forest landscape restoration ( flr ) is a process that aims to regain ecological integrity and enhance human well - being in deforested or degraded forest landscapes 摘要森林景观恢复( flr )是一个过程，旨在恢复采伐迹地或退化森林景观的生态完整性，提高人类福利。
Soil ph , available n and mg increase on burnt sites following the first rainfall , however , soil organic matter , total n , total p , k and ca decrease 火烧迹地在降第一场雨后土壤ph值升高，有机质减少，全氮、全磷、钾、钙等含量减少，而有效氮、镁含量增加。
Through this study and according to the law by which the soil moisture content changes with the time , the soil moisture is determined as consumptive , accumulative , fade - away and stabilization periods 对于土壤渗透，一般情况下初渗和稳渗速度是林内林外空地沼泽化迹地， a层b层。
According to the analytic results in this dissertation , we can find that slope was the pivotal factor for the conversion of the burned blank into coniferous forest , and the partial correlation coefficients is - 0 . 6835 地形因子的分析说明在火烧迹地更新种植针叶林主要是受坡度的影响，偏相关系数为- 0 . 6835 。
Fire raised soil ph , but the soil ph after low and moderate intensity fires returned to the lever before burning faster than after high intensity fires . the changes of soil organic matter and ph were similar after fires 火烧使十壤ph值升高，但随着时间的推移，低、中强度火烧迹地土壤的ph值恢复得较快，高强度火烧迹地土壤的ph值恢复得较慢。
And all cuts down the artificial regeneration mark in the selective felling artificial regeneration center , summer the panda choice selective felling artificial regeneration mark place ratio is higher than all cuts down the artificial regeneration mark place 在择伐人工更新和皆伐人工更新迹地中，夏季大熊猫选择择伐人工更新迹地的比率高于皆伐人工更新迹地。
The essential rule of artificial restoration is matching tree by improving soil or matching site by improving tree species , and the livability of the regenerated coniferous forest reflected the affection of the topography on the artificial reforestation 例如地形对林火迹地(重度火烧区和极重度火烧区)针叶林恢复的影响，它实质是地形对人工更新存活率的影响。
Generally , soil total p increases after burning , but the soil total p after moderate and high intensity fires returned to level before burning slower than after low intensity fires , which is consistent with soil available n . the changes of soil k , mg are great after burning 但6年以后，土壤氮的含量有增加的趋势。除少数迹地外，火烧后土壤全磷含量在若干年内呈增加的趋势，但中、高强度火烧迹地土壤全磷含量的恢复较低强度火烧迹地慢。
In this research project , the agrobacterium tumefaciens mediated transformation of badh gene of tetraploid black locust has been studied , for the purpose of improving resistance to soline - alkali and drought of tetraploid black locust ; of playing more important role in developing of waste lands , ameliorating of soline - alkali soil , and greening and beautifying of surface - mined lands , mine waste dumps , slopes of roads and railroads where restoration of vegetative cover has proven difficult ; of fully making benefits of its ability to fix atmospheric nitrogen in the soil 为了进一步提高四倍体刺槐的耐盐性和抗旱性，进一步扩大其适宜种植的生态范围，充分发挥其固氮、改良土壤的特性，在我国的城镇绿化、荒山造林、盐碱地改良以及采矿迹地、公路、铁路边坡等植物生长困难土地的植被恢复中发挥其优势，本实验对四倍体刺槐进行了农杆菌介导的甜菜碱醛脱氢酶基因转化的研究。
Based on the principle of significant effect of soil fertility factors on forest growth , soil physical factors ( natural water content , bulk density , total porosity , capillary porosity , aggregate degree , coarse silt and physical clay ) , chemical factors ( om . total n , alkali - hytrolyzable n , total p , humus and ha / fa ) and biological factors ( urease , acidphosphotase , invertase and microbes ) were selected as evaluation index system of soil fertility . applying principal component analysis , soil ifi of subalpine coniferous forest was calculated 从土壤物理、化学、生物学三方面出发，建立了川西亚高山针叶林不同演替阶段土壤肥力评价指标体系，应用主成分分析，计算出不同演替阶段土壤肥力综合指标值( ifi ) ，各演替阶段大小顺序为： 10年生云杉林地迹地原始林地次生桦木林地30年生云杉林地20年生云杉林地50年生云杉林地60年生云杉林地40年生云杉林地。
