| Root system, soil moisture, growth speed of caragana (Caragana intermedia ), plant diversity between the caragana forest belt with different belt spacing at Si Zi King county in North Yinshan Mountain were studied by way of digging, soil profile and soil quadrat. Using leaf micro-sections of C. intermedia, C. microphylla, Atriplex canescens, Caryopteris mongholica, Hedysarum laeve, drought resistance of these trees were compared. The results as follows:The total root quality distribution pattern and total root volume distribution pattern were similar to the pattern of roots with diameter≥0.5mm. The superficial area distribution pattern of total roots was similar to the pattern of roots with diameter≤0.2mm. Root density in different forest belt space differed very moch, the density ranked 16m>5m>10m based on belt space. The vertical distribution of root in different forest belt space obeyed different molds, that is, in 5m belt space, roots distribution obeyed the mold y=aebx well, in 10m,16m belt space, root distribution obeyed the mold y=aLn(x)+b, y=ax3+bx2+cx+d, respectively.The caragana forest belt space influenced the roots distribution pattern. The roots distributed as a cross-distribution reduplication pattern when the belt space was 5m. The root distribution pattern was shrub-grass root composite when the belt space was 10m, and shrub-grass root composite and exclusive belt space growth plant root mosaic pattern occurred in belt with space of 16m.Different caragana forest belt space influenced the feedback regulation roles of soil water vertical distribution. The feedback regulation role of soil water vertical distribution was positive when the belt space was 5m, but when the belt was 10m or 16m, it tended to be negative or was negative, respectively.Different caragana forest belt space influenced annual soil water content. Annual soil water content ranked 10m>16m>5m>ck by the belt space. Annual soil water content with 5m belt space decreased as soil deepness increased, that's a decreasing pattern. In contrast, annual soil water content with 10m belt space increased as soil deepness increasing, that's a increasing pattern, and it intervenient with belt space 16m, as a balance pattern. Soil water content vertical distribution obeyed the mold of y=ax2+bx+c and horizontal distribution obeyed the mold of y=ax6+bx5+cx4+dx3 +ex2 +fx+g. The relation complexity increased as the belt space increased.The relation of roots and soil water coupling could be described as the mold of y=ax6+bx5+cx4+dx3+ex2+fx+g (R2≥0.8). Diversity, abundance, uniformity and fodder value of vegetation growing on the belt space increased as the belt space increased, but dominance of a plant decreased. Forestry vegetation was progressive succession.Drought resistance of C. intermedia and C. microphylla was water requisite pattern, A. canescens and C. mongholica was endurance pattern and H. laeve was aridity water requisite pattern. Drought resistance ranked C. intermedia > C. microphylla >A. canescens > C. mongholica >H. laeve. Their drought resistance was similar and all of them could be used as afforestation specieses.
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