| Climate change cause the attention of governments and researchers, the study use of vertical gradient of climate and environment condition of the site on the Gongga mountain, through field simulation of climate warming and nitrogen deposition, to study the natural condition, the moss community composition and biological diversity and distribution pattern, etc. Reveals the moss response to climate change rule and the indicator of the climate change and the response mechanism of climate change.The bryophytes was selected as the indicator plant, which not only distributed in human disturbance such as national forest park, but also widely distributed in the human disturbance larger environment such as cities, has the important research value.(1) compared with no set OTC warming device of the blank group, OTC warming group of air temperature and soil temperature has obvious effect of warming.In the sample area dry heba, OTC warming group the average annual temperature is higher than the control group of3.21℃, the average air humidity is6.70%lower than the control group;OTC warming group average soil temperature is higher than the control group1.82℃, annual average soil moisture1.37%lower than the control group.Long continuous fascine dam, warming group2.12℃, annual average temperature is higher than control group on average air humidity is lower than the control group6.10%;Warming group Mark Twain is higher than the control group on average1.41℃, annual average soil moisture4.33%lower than the control group.According to the intergovernmental panel on climate change (IPCC) fourth assessment report issued by the (IPCC), it is estimated that by2100the average global temperature increase of1.1°C to6.4℃.This two kinds of ways of warming in the study of the effect of warming of the air temperature in the range.(2) in the two sample area, increasing nitrogen and TOC of bryophyte H value index had significant effect on the (Shannon-Wiener index).In a separate OTC heat treatment in the experimental group H value is higher than the control group;And in a separate increase N treatment group, the H value is lower than the control group.In OTC heat and increase the N treatment in the experimental group, H value is higher than the control group, and also significantly higher than that in the over-the-counter (OTC) heat treatment or N treatment of the experimental group.Continuous dry damming of the experimental group and control group (Simpson index) between the D value also showed similar trends and H.But in SPSS software, the data obtained by one-way ANOVA analysis it is concluded that dry river dike OTC heat treatment, N and N OTC heat and processing the data difference coefficient of the experimental group and control group all p>0.05, were not significant difference, namely the continuous dry damming, although over-the-counter (OTC) heat treatment, N and N&OTC and processing for bryophyte Shannon Wiener index and Simpson index, but the control group showed significant difference.(3) The soil respiration rate showed obvious seasonal changes during November7,2012to the November7,2013.Soil respiration rate highest in July and November minimum;The change law of soil respiration rate of the experimental group.In the measurement of two growing season, OTC warming group and N group and N group OTC warming and soil respiration values are generally higher than that of no processing of the control group, including over-the-counter (OTC) group was most evident influence on soil respiration.November7,2012, data show the value of soil respiration in OTC warming group increased the most, compared with the control group of soil respiration rate, average increased by0.880.51μmol CO2m-2s-1;Increasing N group compared to control group grew by an average of soil respiration0.140.51μmol CO2m-2s-1;OTC warming and increased N group compared to control group grew by soil respiration rate was3.40μmol CO2m-2s-1.In the summer (July) at high soil temperature, the biggest OTC warming impact on soil respiration.(November) OTC wanner in winter and a N the biggest impact on soil respiration.November7,2013, data show the value of soil respiration in OTC warming group increased the most, compared with the control group of soil respiration rate, average increased by0.51μmol CO2m-2s-1; Increasing N group compared to control group grew by an average of0.21μmol CO2m-2s-1;OTC warming and increased N group compared to control group grew by an average of soil respiration rate was0.41μmol CO2m-2s-1.In the summer (July) at high soil temperature, the biggest OTC warming impact on soil respiration.(November) OTC warmer in winter and a N the biggest impact on soil respiration. |
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