After 5 years of comprehensive harnessment, various measures were accomplished in an area of 751km2, increasing the base farmland by 1800hm2, building 62 silt arresters.
In this paepr,the effect of flood retaining of forests have been analyzed in the way of hydrology.The main points are as follows. ①The factors influencing flood retaining of forests are very miscellane- ous.Besides the features of forest itself,what is the most important is the thickness of the soil layer of aeration zone(abbreviated“soil layer”in the following).This is the main reason why the capacities of flood retaining of forests are in great change in different areas. ②The type of runoff generation is ...
Debris flow acts violently in Panxi where man's economic action is frequent.It damages the natural ecology environment,especialy the forest ecological system to exploit the resources during the long history and economy development in the region,for instance, to cut down forest seriously,to destroy forest and reclaim wasteland,to reclaim on steep slope,to explore stone for road construction,to mine and wantonly pour dregs and take biological energy resource excessively,etc.,induce the expansion of the mounta...
Factors causing soil erosion are in many aspects,the natural factors areonly potencial ones, the excessive disturbance or damages to nature fromhuman being is the principal causes to produce serious soil erosion, whichis thought as the greatest obstacles to the development of the economy inFujian Province. The controlling measures are presented in the paper asfollows: 1, determine a "policy favorable to mass" to stimulate the activityof the mass; to harness mountainous region, and to plant trees or grasses;...