Integration Of Chinese Two Grassland Classification Systems And Its Application In Grassland Of Inner Mongolia

Two classification systems in China, one namely Chinese grassland classification systemwith qualitation, and other called Comprehensive and Sequential Classification System ofgrassland (CSCCS) with quantitation own divergence owing to their features in actualapplication, respectively. However, Mr Ren ji-zhou indicates that the stability order oftopography and environment involving to grassland classification is climate, land, andvegetation, successively. Due to the advantage and disadvantage for qualitative andquantitative classification system, there will be necessary for their integration with each other,which can be one new trend for grassland classification since it can more objectively andaccurately explore the ecological relationship between grassland and climate. This paperaimed at solving the following questions:1) through comparison and analysis of theirclassification indices, names, and property, two grassland classification systems wereintegrated and incorporated.2) Micro-topography factors such as slope and aspect, andOrdinary Kriging (OK) function instead of Inverse Distance Weighted (IDW), were appliedinto constructing Improved-AMMRR (the Analytic Method based on Multiple Regression andResidues) spatial interpolation method. Subsequently, it was used in spatial simulation of＞0℃annual accumulated temperature (Σθ), annual precipitation (r), humidity (K) andgrassland CSCS classification on the Arc GIS platform in Inner Mongolia municipality.3)Integration results comparison of grassland classification between Chinese grasslandclassification system and CSCS in Inner Mongolia by using spatial overlay analysis method.(2) Taking year1986as limit to explore the impact of climate change on Inner Mongoliagrassland. The results were obtained as followed.1) Integration result of two classification systems illustrated that except tropical andsubtropical desert class (VA5VIA6, VIIA7), subtropical semi-desert class (VB12) and foresttypes (VD26, VID27VIID28IIIE31IVE32, VE33, VIE34, VIIE35, IIF37, IIIF38, IVF39,VF41, VIIF42) of CSCS, the classification indices, names and attributes of other grasslandclasses in CSCS were highly agreement with the classification result of Chinese grasslandclassification system.2) Mean absolute error (MAE), mean relative error (RME) and root-mean-square error(RMSE) of Σθ and r based on I-AMMRR in Inner Mongolia, were lower than that ofAMMRR method, which indicated that the spatial interpolation method of I-AMMRR hadhigher precision. 3) Inner Mongolia grassland was classified into17classes based on CSCS, includingfrom IIIF38(cool temperate perhumid mixed coniferous broadleaved forest) toIIIA3(cooltemperate-extrarid temperate zonal desert).Wherein, IIIB10(cool temperate-arid temperatezonal semidesert) had the largest area while the distribution area of Ⅳ E32(Warmtemperate-humiddeciduous broad leavedforest) was smallest, which was consistent with resultof vegetation investigation in Inner Mongolia.4) The coincidence degree of grassland classification results for two classificationsystems was61.44%in Inner Mongolia. Regrettably, the unique difference was that nativegrassland classes in CSCS was evolved secondary grassland classes in Chinese grasslandclassification system under the worse climate condition, which illuminated that grassland hadbeen conversely evolved due to artificial disturbance broken threshold value of nativegrassland ecosystem.5) Taking year1986as limit, the distribution area of arid and semiarid regions increasedin Inner Mongolia with desert, semi-desert, typicalsteppe increasing and meadow steppe,forest steppe and forest decreasing, which showed that grassland in Inner Mongolia wasevolving to relative warmth and drought. Consequently, protection for example fence grazing,rotational grazing, forbidden grazing, and fallowing grazing should be applied into grasslandmanagement in order to ensure grassland possessing the chance of rehabilitation.