Wwibei Arid Platform Excperiment Research On Agri-Forestry System Of Water Balance Factor Variations

The model of agri-forestry system runs for thousand years more, only in these years, as a science, does a deep research begin. At present, studies on soil water displacement pursue mostly pure farming land and pure forest field, and it has less study on agri-forestry system of its soil water movement. If there are some, most study the impacts of soil water content on forest growth, crops growth or its productivity. We choose some soil water mechanical methods for a experiment research of change principles in such system of water balance factors. Two years of on-the-spot surveying and tests lead to the following conclusions. The tests shows that: Zanthoxylum Bungeanum belongs to types of short roots, at 0?120cm layers in vertical distribution of æ…¥?type in great difference, and the difference decreases with the increase of depth; At 0?50cm horizontal distribution, the roots stretch in stairs, among which in scope of 0?50cm (some 2 times of tree height) most roots are concentrated in distribution, those roots weight taking 70% of total. The root length density and root weight of their spatial distribution present the following features: closer to the forest edge of its water absorb system, tenser the root length, most parts in vertical distribution concentrated in the scope of 0?0cm. At forest edge of 0?0cm layer, the root length density takes 95.9% in layer of 0?20cm, mostly in layer of 20?Ocm. Forest root of its two-dimensional distribution absorbs multielement non-linear regression analyze. The regression equation for red pepper L, root weight G and, distance from forest H and soil depth Z as follows: 2. The analyze on root area and available root length density of artificial Robinia Pseudoacacia and Platycladus Orientalis is shows: At the same ages of the both trees, Platycladus Orientalis root system owns 2 times of Robinia Pseudoacacia is in depth, but the average available root length of acacia takes only 44.5% of Biota oriental is. The both trees of their max available root length in vertical direction are situated within 0?0cm from surface, in horizontal direction, the available root length of acacia turns the maximum at 30?0cm from the truck., while the Robinia Pseudoacacia is at 0?0cm. That means the available root density takes 1.64 times of Platycladus Orientalis, but the main root systems in even distribution within 00cm, and generally the density of Platycladus Orientalis larger than Robinia Pseudoacacia is. At artificial forest, the root density distribution varies in types in horizontal direction, Biota oriental is forms basically reverse correlations, and Platycladus Orientalis presents distribution of a second-degree parabola. In vertical direction, they owns unanimous principle with that of crops in density distribution, that is, index decreases with more depth. Non-linear parameter adapting analyze shows the function model takes RE^{x, z} which narrates good the spatial distribution of root systems. 3. At agri-forestry system, wheat root distribution features mostly this way: its roots reduces neighboring the forest; In vertical direction, the root concentration is mostly at 0-20cm, denser when closer to the forest belt. 4. In Weibei arid area, tests and analyzes on ater mc ement parameters at non-saturated soil in t o soil types bet een agri-forest and artificial forest system are performed. By the data and Le enberg arquardt non-linear parameter adapting method, some math formula are recei ed for the non-saturated soil layers in different ecologies. The models fit good in pr...