Undergrowth

About: Undergrowth is a research topic. Over the lifetime, 795 publications have been published within this topic receiving 11911 citations. The topic is also known as: understorey & underbrush.

Ecological breeding method suitable for mountain forest land undergrowth chicken raising

Abstract: The invention discloses an ecological breeding method suitable for mountain forest land undergrowth chicken raising. The ecological breeding method comprises the following steps: selecting a mountain forest land of which the slope is less than 30 degrees to establish an undergrowth chicken raising ecological breeding aquatics village (1), wherein the average height of the forest canopy of the undergrowth chicken raising ecological breeding aquatics village (1) is above four meters, and the canopy density of the forest canopy is 0.5-0.6; at least planting a shrub isolation layer (2) on an edge near the bottom end of a hillside of the undergrowth chicken raising ecological breeding aquatics village (1). Compared with the prior art, the ecological breeding method has the advantages that the method can effectively alleviate a water and soil loss problem caused by vegetation deterioration in a mountain forest land undergrowth chicken raising process while a purpose of isolation protection is achieved. The ecological breeding method has the advantages of simpleness in operation, low cost and ecological environment protection and is an auxiliary protection means for the ecological breeding.

Dynamics of nitrogen and phosphorus concentrations of fine roots in a mixed forest of Cunninghamia lanceolata and Tsoongiodendron odorum

Abstract: From September 1999 to July 2000, N and P concentrations of fine roots were measured with the method of sequential soil core at bimonthly intervals in a mixed forest of Tsoong's tree (Tsoongiodendron odorum Chun) and Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) in Sanming, Fujian. The results showed that N, P concentration of Chinese fir and Tsoong's tree in fine roots were negatively related to root diameter size. The concentrations of N and P in living roots and dead roots were compared. The order of N concentration in fine roots in different samples was Tsoong's tree>undergrowth>Chinese fir, while that of P was undergrowth>Tsoong's tree>Chinese fir. For Chinese fir, the seasonal change of N, P concentrations in fine roots with various diameter classes showed a single-apex curve with a maximum in September. For Tsoong's tree, maximized concentration of N in fine roots appeared in July or September and maximized P concentration in May.

Study on carbon storage and distribution patterns of Pinus elliottii stand in rocky desertification area in Shaoyang county,Hunan province

Abstract: Carbon content and carbon storage and distribution pattern in different rocky desertification degree(mild,moderate,and severe) Pinus elliottii artificially young forests in Shaoyang county were investigated in field sample plot with the method of indoor potessium dichromate potassium-hydration heat.And the results show that: in the rocky desertification control engineering,the spatial distribution of carbon stock of Pinus elliottii plantation ecology system were: soil layerthe tree layerthe undergrowth layerlitter layer.Carbon stock total range was 20.018~41.284 t/hm2,and the average value was 29.563t/hm2.With the increasing of rocky desertification degree and the decreasing of stand density,carbon ossus point also reduced,and the differences were significant.Soil carbon ossus point were 26.109t/hm2,19.165t/hm2,14.282t/hm2 respectively.The tree layer carbon ossus point were 4.817t/hm2,13.800t/hm2,2.319t/hm2,respectively.And more serious the rocky desertification was,the carbon stock was more smaller.The order of each component carbon storage in mild and moderate was trunktree leavesrootbranch,in severe was tree leavestrunkrootsbranches.while,the carbon stock of undergrowth and litter layer were the smallest in the mild rocky desertification,their average values 2.030t/hm2,0.703t/hm2 respectively.