The Traits And Adaptive Strategys Of Main Herb-aceous Plants And Lianas On Micro-topographical Units In Huangcangyu Reserves Of Anhui Province

Huangcangyu reserves of Anhui province is the most well preserved vegetation zone in Huaibei area and the ideal place for studying main flora in warm temperate zone and its development status. We investigated the distribution of the major advantage herb and vine plants in different micro-topographical units. By analysis of the physical and chemical indices of soil and the differences in distribution and traits of dominate species, come out the plant adaptive strategies to the climate change in micro-topographical units. Here are the key conclusions:1. In the survey,17herbaceous plants and lianas were recorded which belong to13families15genera and divided into9main community.The main advantage plants were Poa acroleuca, arthraxon hispidus, Trachelospermum jasminoide,Smilax davidiana, Clematis hexapetala Pall.var.Tchefouensis, Chrysanthemum indicum, Carex tristachya Duchesnea indica, Viola oncordifolia, Among which Viola oncordifolia mainly distributed on the crest slope, Duchesnea indica on the foot slope,and the rest advantage plants existed in allmicro-topographical units.2. From crest slope to foot slope, the nitrogen content, phosphorus content, PH and the content of organic matter of the soil all showed significant differences. Among these micro-topographical units, nitrogen content, phosphorus content, organic matter content of the soil on crest slope were the highest, showing best nutritional status, while the soil phosphorus conent in sideslope was the lowest, organic matter content in foot slope was lowest The temperature, moisture, and salinity of soil were the highest on the foot slope, while lowest in temperature and salinity on the crest slope. However, Soil pH in all micro-topographical units presented no significant differences.3. There are remarkable differences in the traits of herbaceous plants and lianas in micro-topographical units, indicating response of plants to the change. The change of traits varied with the species. Except for the leaf length (LL), significant differences existed inthe traits of Poa acroleuca, in which leaf dry matter content (LDMC), specific leaf area(SLA), leaf nitrogen concentration(Nmass), the ratio of leaf nitrogen concentration and leaf phosphorus concentration (N/P) on crest slope were the highest, thereinto the minimum of SLA appeared on the foot slope, leaf phosphorus concentration (Pmass), root shoot rate (R/S), Nmass minimum appeared on the crest slope; SLA, R/S, leaf N, N/P of Arthraxon hispidus reached the maximum on the crest slope, and R/S, leaf N, N/P on side slope were minimum. Smilax davidiana, the maximum of SLA, R/S, Nmass occured on the crest slope, that of N/P value and LDMC, Pmass on side slope and on foot slope, respectively.; there were no significant difference on the LL and SLA of Trachelospermum jasminoides in micro-topographical units, LDMC and N/P on the side slope wasthe maximum, R/S, and Nmass, Pmass minimum all appeared on sideslope; besides the difference on LL of Chrysanthemum indicum was not significant as well, the SLA, Nmass, Pmass in leaves got maximum on foot slope, whereas R/S and. N/P got maximum on the side slope.4. traits of plants are affected by various factors. The plants traits were not correlated with soil character, such as LL, only a few traits were significantly correlated with the soil, among which were the sensitive SLA and N/P that was showedfar outweighing16, exhibiting restriction of P on the plant growth in this district, In addition the responses to soil nutrients was greater than the changes of soil physical indices.5. The plant traits correlation analysis shows that in addition to leaf P and N/P existing significant negative correlation in all species, there are certain differences in the correlation of the other properties. Poa acroleuca N/P and R/S was in significant negative correlation, while the other traits showed no significant correlation; Arthraxon hispidus SLA and R/S are in significant positive relationship with Nmass, the SLA had a significant negative correlation with LDMC, the rest traits were no significant correlation; The SLA and leaves N in Smilax davidiana had a significant positive correlation with leaf P, and LL did with N/P as well, while R/S and LDMC existed significant negative correlation; N/P and leaf N of Clematis hexapetala Pall.var tchefouensis presented significantly positive correlation, the rest traits were in no significant correlation; Trachelospermum jasminoides LDMC and leaf N were significant negative correlation while leaf N and leaf P were in significantly positive correlation, as well as leaf P and SLA.