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Xiao S.-H.,Fujian Agriculture and forestry University | He D.-J.,Fujian Agriculture and forestry University | You H.-M.,Fujian Agriculture and forestry University | Liu J.-S.,Tianbaoyan National Nature Reserve | Cai C.-T.,Tianbaoyan National Nature Reserve
Beijing Linye Daxue Xuebao/Journal of Beijing Forestry University | Year: 2012

The storage of coarse woody debris (CWD) in three typical forests (Tsuga longibracteata, Rhododendron simiarum, Crytomeria fortunei) at Tianbaoyan National Nature Reserve, Fujian Province of eastern China was investigated. The results were as follows: 1) the storage of CWD in the three typical forests was 33.6, 45.3 and 31.8 t/hm, which was at the middle level of tropical and subtropical regions in China. 2) In different decay classes, CWD forms made greater contribution to the CWD storage differences. 3) In R. simiarum and T. longibracteata forests, CWD storage distribution was found highest in fallen trees, middle level in snags, and lowest in stumps; while in C. fortunei forests, the distribution was highest in snags, middle level in stumps and with the lowest level in fallen trees. 4) In the middle and high decay classes, this study indicated that the CWD storage in R. simiarum forests was higher than that in T. longibracteata forests, and the storage in C. fortunei forests stayed the lowest; in the low decay class, the CWD storage was highest in T. longibracteata forests, lowest in C. fortunei forests, R. simiarum forests lied in middle. 5) The ratio of snags and stumps in forests, which was free from human interference, was apparently higher than that in C. fortunei forests, but the proportion of fallen trees was very low. Source


You H.,Fujian Agriculture and forestry University | He D.,Fujian Agriculture and forestry University | Liu J.,Tianbaoyan National Nature Reserve | Cai C.,Tianbaoyan National Nature Reserve | And 2 more authors.
Journal of Plant Resources and Environment | Year: 2013

Taking Tsuga longibracteata W. C. Cheng forest in Tianbaoyan National Nature Reserve as research object, effects of covering with fallen logs or not and decay degree of fallen logs on eight soil physicochemical indexes (including water content, bulk density, total porosity, contents of organic carbon, total N, total P and total K, and C/ N ratio) were researched, and change of these indexes of soil after covered with fallen logs was compared in different seasons and different type forests. The results show that after covered with fallen logs, soil bulk density decreases, total porosity and water content increase, contents of organic carbon, total N and total K all increase as compared with no covering with fallen logs, meaning that covering with fallen logs generally improve soil fertility under T. longibracteata forest. But there is unsignificant effect of covering with fallen logs or not on soil physicochemical property. After covered with fallen logs at different decay degrees, there is a significant difference (P< 0. 05) in soil organic carbon content with a basically gradually increasing trend as increasing of decay degrees of fallen logs, while there are unsignificant differences in other seven soil physicochemical indexes. Contents of total N, total P and total K in soil covered with fallen logs of moderate decay (III class) all are the highest. After covered with fallen logs, there is an unsignificant change in soil total P content in different seasons, while there are significant changes in other seven soil physicochemical indexes in different seasons (P<0. 05). After covered with fallen logs, bulk density and total K content of soil in autumn, winter, spring and summer increase in order while total porosity and organic carbon content decrease in order, and water content of soil is the lowest in autumn and the highest in spring. On the whole, after covered with fallen logs, there is a significant difference (P <0. 05) in eight soil physicochemical indexes in difference type forests of T. longibracteata forest. Comparing with four mixed forests, water content, bulk density and total K content of soil covered with fallen logs in T. longibracteata pure forest all are the highest, while total porosity is the lowest, organic carbon content is relatively low, C/ N ratio and contents of total N and total P are in middle. It is suggested that in T. longibracteata forest of Tianbaoyan National Nature Reserve, covering with fallen logs is beneficial to improving soil physicochemical property and enhance soil fertility. Source


You W.,Fujian Agriculture and forestry University | Lin Q.,Fujian Agriculture and forestry University | He D.,Fujian Agriculture and forestry University | You H.,Fujian Agriculture and forestry University | And 5 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2011

Analyzing on the relationship between environmental elements and landscape pattern contributes to the changing mechanism of landscape pattern. Based on TM image, topographic map and the second class investigation, and by means of 3S technology, the relationships between forest landscape pattern and environment factors were analyzed quantitatively with CCA (Canonical Correspondence Analysis) in the Tianbaoyan National Natural Reserve, China. The results showed that the total Eigen value of ordination axes were 3.137, 3.349, 3.484, 4.660 and 4.848, respectively, increasing with the downscaling. However, both the cumulative percentage variance of landscape-environment relation and landscape-environment correlation coefficients first increased and then decreased, with the maximum values at scale3 and scale2, respectively. The landscape presented an obvious latitude variation (the correlation coefficients between latitude and first axis were -0.2019-0.3789) and vertical distribution regularity (the correlation coefficients between elevation and first axis were -0.3218-0.4760) . The latitudinal gradient distribution regularity was as follows: bamboo grove, deciduous broad leaved forest, mixed broadleaf-conifer forest, farmland, evergreen broadleaf forest, mountaintop elfin forest, evergreen coniferous forest, sphagnum moss, shrub-meadow. Bamboo grove and farmland distributed at low elevation comparing with sphagnum moss, shrub-meadow and mountaintop elfin forest at high elevation. It is suggested that the relationship between landscape and environment have scale effect, and the environmental elements have different impacts on landscape pattern at different scales. Source


You H.-M.,Fujian Agriculture and forestry University | He D.-J.,Fujian Agriculture and forestry University | You W.-B.,Fujian Agriculture and forestry University | Liu J.-S.,Tianbaoyan National Nature Reserve | Cai C.-T.,Tianbaoyan National Nature Reserve
Journal of Mountain Science | Year: 2013

We investigated the quantity and quality of fallen logs in different Tsuga longibracteata forest communities in the Tianbaoyan National Nature Reserve. We used redundancy analysis to determine the spatial distribution of fallen logs in the different forest communities and to analyze the relationships among stand structure, topographic factors and human disturbance. The volume, covered area, mean log length and number of fallen logs differed significantly among forest types (P < 0.05), but mean diameter at breast height showed no significant difference (P > 0.05). The log volume and covered area in different forest types showed the following trend: T. longibracteata pure forest < T. longibracteata + Oligostachyum scabriflorur < T. longibracteata + hardwood < Rhododendron simiarum + T. longibracteata < T. longibracteata + Phyllostachys heterocycla pubescens. The spatial distribution patterns of logs quantity and quality indicated that log volume and covered area were strongly affected by environmental factors in the following order: human disturbance > elevation > slope position > bole height > tree height > slope aspect > density > basal area > slope gradient. The relative contribution of environmental variables on the total variance was topography (76%) > disturbance (42%) > stand structure (35%). Topography and disturbance combined explained 83% of the variance. Fallen logs quantity and quality were negatively related to elevation and slope position, and positively associated to human disturbance. The log volume decreased from northern to southern slopes. Environmental factors had the highest impact on class I (slightly decayed), and lowest impact on class V (highly decayed). © 2013 Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg. Source

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