Soil-Plant System Basic Characteristic Of Shrub Communities In Periglacial Landform Of Liaoning Eastern Mountains

The above 1200 m periglacial landforms of Mt. Laotudingzi in Liaoning Eastern Mountains is widely developed bushwood and meadow thicket community, its unique design of the soil-plant system has a higher organization and self adjustment ability, thus plays a role in the overall stability and integration of periglacial landforms in natural environment. Based on this,the study put shrub communities of periglacial landforms of Mt. Laotudingzi in Liaoning eastern mountains as the study area, adopting the research method of field investigation, laboratory test and statistical analysis, based on the field investigation data of 36 quadrats in shrub layer and 45 quadrats in herbaceous layer in 9 sample plots, the basic quantitative characteristics and soil environmental characteristics of shrub communities of periglacial landforms are studied based on the scientific classification of shrub communities of periglacial landforms of Mt. Laotudingzi in Liaoning eastern mountains, and the mutual influence of shrub communities in soil-plant system is analysised quantitatively, the main conclusion is that:(1) 9 bushwood association of Periglacial Landform of Mt. Laotudingzi can be divided into 6 bushwood formation, 2 vegetation types, including 7 bushwood communities and 2 meadow thicket communities.(2) In 9 bushwood acommunitys of Periglacial Landform of Mt. Laotudingzi there are 41 families 82 genera and 109 species of vascular plants. 7 bushwood communities.are all make up by the shrub layer and herb.layer. The constructive species of the 2 meadow thicket communities are both Herb plant, and many low shrubs which height and crown width both is not match herb plants.In the bushwood communities the proportion of phanerophyte is 15.8%~40.7%, chamaephytes are rare, the proportion of hemicryptophyte is 22.2%~42.1%, the proportion of Cryptophyte is 29.6%~45.2%, a very small proportion of annual plants.(3) Litter amount in shrub communities of periglacial landforms of Mt. Laotudingzi is 2.23~9.55t/hm2,the litter layer thickness is 1~3cm. Litter contains 8 major elements necessary for the normal growth of plants C,N,K,Ca,Mg,P,S,Si,the reserves is 0.36%~60.94%;and the reserves of 7 micronutrient elements Fe,Zn,Mn,Cu,Na,Ni,Clis 0.01%~3.19%.(4) Shrub communities of periglacial landforms of Mt. Laotudingzi are mountain dark brown forest soil, the thickness of soil layer 15~100cm, soil p H is 4.38~4.99, surface soil salt content and electrical conductivity in solution is extremely low, the acidic leaching is very strong, the soil is wet and cold.Soil in the shrub communities contains various oxide, the content of Si O2 is up to 43.431%~50.354%, the content of CO2 and Al2O3 changing between 21.092%~30.877%,12.619%~14.785% respectively is also higher.(5) There is significant negative index correlation between litter amount and the herb layer coverage in shrub communities of periglacial landforms of Mt. Laotudingzi(R=-0.804,P<0.01,n=9), there is negative index correlation between litter amount and Shannon-wiener in the herb layer(R=-0.796,P<0.05,n=9), there is positive index correlation between soil thickness and the average height of herb layer(R=0.671,P<0.05,n=9); the relationship between litter nutrient reserves, soil nutrient content and the basic characteristics of the community is complex; there is no obvious correlation between litter amount and soil oxide content; the relationship between litter nutrient reserves and soil characteristics, soil nutrient content is also very complex.