Rumex japonicus, Polygonum orientale, Gnaphalium affine, Astragalus sinicus and Boehmeria nivea were the typical dominant plants which had strong enrichment ability of heavy metals. The heavy metals determined results indicated that the contents of copper and cadmium in some dominant plants' root zone soils exceeded the third class of the soil environmental quality standards. The highest content of copper in plant root zone soils was 824.03 mg·kg^-1 and the highest content of cadmium in plant root zone soils was 5.03 mg·kg^-1. And the five dominant species showed hyperaccumulation ability to one or two kinds of the heavy metal pollutants including copper, lead and cadmium. For example, Polygonum orientale had strong accumulation ability on copper and the highest content in P. orientale reached to 148.80 mg·kg^-1; another kind of dominant plant is Gnaphalium affine,the bio-concentration factor values of the three heavy metal elements were much more than those of other plants; the maximum cadmium content in G. affine was 15.17 mg·kg^-1 and the maximal value of bio-concentration factor value was 19.14,which was more than 10 times higher than those of other plants,which showed that G. affine possessed basic characteristics of accumulation on cadmium,and which also showed that G. affine had the characteristics of co-accumulation on copper and cadmium with higher tolerance, Astragalus sinicus and Rumex japonicus also possessed copper and cadmium co-accumulation characteristics. The five dominant plant species had certain reference values on the ecological restoration of heavy metals copper, lead and cadmium pollution on the wetland of Poyang Lake and Lean River.]]> 2015/12/14 17:02:49 1,2*, ZHOU Xue-Ling¹, YU Hou-Ping¹, ZHU Yong-Mei³]]> JIAN Min-Fei^1,2*, ZHOU Xue-Ling¹, YU Hou-Ping¹, ZHU Yong-Mei³ 6true Scirpus tabernaemontani that came from ground water level was zero(experimental group), compared with the S. tabernaemontani grew in normal water environment(control group, flooding about 20 cm), so as to reveal the impacts of S. tabernaemontani growth to zero ground water level(drought). The relative growth rate of S. tabernaemontani varied in different periods, the experimental group and control group were 2.00 cm·d^-1 and 3.18 cm·d^-1 in May, 2.35 cm·d^-1 and 2.44 cm·d^-1 in early June, 0.95 cm·d^-1 and 0.99 cm·d^-1 in late June, 0.02 cm·d^-1 and 0.05 cm·d^-1 after July respectively. The average number of branches of experimental group was 2.94 branches per plexus and control group was 4.86 branches per plexus. The diameter of experimental group was 5.15 mm and the control group was 7.33 mm. The relative moisture content of S. Tabernaemontani was 73.28% in experimental group and 75.28% in control group. The average content of MDA in the experimental group was 10.27 μg·kg^-1 and the control group was 6.46 μg·kg^-1. The average value of proline content was 9.44 μmol·kg^-1 in experimental group and the control group was 6.40 μmol·kg^-1. These indexes differences were all significant except for relative moisture content between experimental group and control group(The control group was better than that of the experimental group),which showed that zero ground water level was not conducive to S. tabernaemontani's growth, would decrease the productivity of wetland ecosystem that was mainly S. tabernaemontani, and would accelerate this wetland ecosystem degradation succession. This article would provide scientific basis for revealing the serious effects on the growth of wetland aquatic plants and plateau wetland ecosystem result from climate chang(drought).]]> 2015/12/14 17:02:51 1, TIAN Kun^2,3*, YUE Hai-Tao²]]> ZHAO Xiang-Jiang¹, TIAN Kun^2,3*, YUE Hai-Tao² 5true Excentrodendron tonkinense,Cephalomappa sinensis,Deutzianthus tonkinensis, Litsea dilleniifolia in Nonggang and Eberhardtia aurata,Madhuca pasquieri,Lithocarpus pseudovestitus,Hopea chinensis in Shiwandashan. All individuals of tree species with DBH(Diameter at breast height)greater than 2 cm were recorded and identified to species. Based on the sample data of 10 m×10 m subplots,species number was counted by a series continuous sample area. In order to determine the optimal SARs models and sample effects on SARs models,we constructed three SARs models(Logarithm model,Logistic model,and power model)from noncontiguous grid combinations design based on survey data of typical forest communities. To assess the effects of minimum measured DBH on SARs,species numbers of individuals with DBH≥2 cm,DBH≥4 cm,DBH≥6 cm,DBH≥8 cm,DBH≥10 cm were counted separately. We used least square method and Gauss-Newton method to estimate the parameters of SARs models. Akaike Information Criterion(AIC)was used to compare the goodness-of-fit of each model. Spearman rank correlation was used to assess the effect of base sample unit and minimum measured DBH on SARs. The results showed that logistic model was the best among the three SARs models both in karst area and non-karst area. Base sample unit and minimum measured DBH both had significant effects on SARs,but the effect varied among the SARs models. We argue that logistic model is a robust model to describe SARs of tree species in karst and non-karst forests in north tropics Guangxi. The results also suggest that special attention must be paid to the influence of sample methods as applying SARs models to protection practices.]]> 2015/12/14 17:02:52 1,2, LU Shu-Hua^1,2, WEN Shu-Jun^1,2, DING Tao^1,2, WANG Bin^1,2, ZHOU Ai-Ping^1,2, HUANG Fu-Zhao^1,2, LI Xian-Kun^1,2*]]> XIANG Wu-Sheng^1,2, LU Shu-Hua^1,2, WEN Shu-Jun^1,2, DING Tao^1,2, WANG Bin^1,2, ZHOU Ai-Ping^1,2, HUANG Fu-Zhao^1,2, LI Xian-Kun^1,2* 4true 2015/12/14 17:02:53 1,2, LI Qing-Fang^2,3, ZHANG Chao-Lan¹, ZHANG Chun-Lai², BU Qiao-Zhen^2,3,CAO Jian-Hua^2*]]> FANG Pei-Jie^1,2, LI Qing-Fang^2,3, ZHANG Chao-Lan¹, ZHANG Chun-Lai², BU Qiao-Zhen^2,3,CAO Jian-Hua^2* 3true Hedychium coccineum was used to be an example to evaluate the valid of introduction regionalization conducted by MaxEnt modeling framework according to the theoretical method together with introduction practice. Temperature,rainfall and altitude environmental factors were selected to be analyzed on the basis of collection for geography distribution data. And 75% data were used to construct model while the remaining were used to evaluate the valid of model by drawing receiver operating characteristic(ROC)plot. At last, suitable categories were determined by comparing the cultivated data with prediction map. The results showed that the area under the curve(AUC)was 0.991 diagnosed as excellent, which indicated that the model was highly reliable. Meanwhile, all the data were used to make a predicition map in MaxEnt. Further, categories were divided by comparing the location of introduction data with the map. The results indicated that H. coccineum could be cultivated successfully in the area where the above 0.01 when the suitability degrees between 0 and 1 were divided into eleven categories. In all, if the wild plant to be introduced in near-nature forestry, the highly reliable introduction regionization map could be made in MaxEnt.]]> 2015/12/14 17:02:53 1, GUO Wei¹, WU Fu-Chuan², LIU Nian^1*]]> HU Xiu¹, GUO Wei¹, WU Fu-Chuan², LIU Nian^1* 2true Alternanthera philoxeroides, an invasive clonal weed, as the objective and studied on the morphological plasticity of roots in the heterogeneous patches of resources. Ramets were planted in the patches with heterogeneous distribution of light and soil nutrient and there were four treatments, e.g. ①two ramets experienced high light and low nutrient treatment(HL-HL); ②two ramets experienced low light intensity and high nutrient treatment(LH-LH); ③proximal ramets experienced high light and low nutrient treatment, distal ramets experienced low light and high nutrient treatment(HL-LH); ④proximal ramets experienced low light and high nutrient treatment, distal ramets experienced high light low nutrient treatment(LH-HL). Parameters of roots were analyzed with WinRHIZO Pro software and the effect of treatment on these parameters of proximal ramets, distal ramets and whole ramet pairs was tested with one-way ANOVA(SPSS 18.0). Our results were as follows: Ramets in high light and low nutrient patch allocated more biomass to aboveground parts, while ramets experienced low light and high nutrient allocated more biomass to the underground parts. A. philoxeroides ramets showed the division of labor by changing the root-shoot ratio of biomass. In heterogeneous environments, the root of A. philoxeroides ramets in the eutrophic patches had higher root biomass, root length, root surface area, root volume and branch coefficient, etc. A. philoxeroides increased nutrient uptake capacity through the form of root morphological plasticity in heterogeneity habitats. Thus, A. philoxeroides improved resource absorption capacity by specializing resource acquisition organs, which may play an important role in its successful invasion.]]> 2015/12/14 17:02:54 *]]> ZHENG Peng-Qin, HUANG Si-Qian, SONG Hui-Xing^* 1true