Study On L Chinensis Population Dynamics In Different Habitats In Zhalong Nature Reserve

Leymus chinensis (Trin.) Tzvel.serves as one of important herbages of our country. Therewas of significance both in theory and practice in studying population dynamics of Lchinensis in different habitats. L chinensis populations in different habitats in Zhalong NatureReserve were studied at population level sampled by unit area in this experiment, and agestructures of tillers and rhizomes and buds were determined by using the perfect researchmethod of age structure of clone population of rhizome grass. Dynamics of L chinensispopulations in different habitats, inter-forest sand soil, sand soil, meadow soil and mediumsaline alkalize soil were studied in the order of time in terms of natural growth character of Lchinensis. The results showed that L chinensis is distributed widely in the inter-forest sandsoil, sand soil, meadow soil and medium saline alkalize soil and formed single dominantpopulations, which is the non-zonal vegetation type. The tillering node of the L chinensispopulations can survived over four years at most and can reproduce three generations byvegetative reproduction. There were three age classes of the tillers at most, and the numbersof vegetative tillers was sand soil>inter-forest sand soil>meadow soil>medium saline alkalizesoil, while the number of reproductive tillers was medium saline alkalize soil >inter-forestsand soil>meadow soil> sand soil. The 1st age and 2nd age class tillers were all dominant, and3th age class tillers were the least. The number of the tillers were all increasing age structure,and the most contribution to sexual reproductive was the 2nd age class tillers, and the biomasswas sand soil >inter-forest sand soil>meadow soil>medium saline alkalize soil. The agestructure showed the same rule that the most contribution to the matter reproduction was thelow age class tillers and the lower of age class of the tillers was, the biomass was higher andthe competition was stronger. The height of the vegetative tillers and reproductive tillers wereall sand soil >inter-forest sand soil>meadow soil>medium saline alkalize soil, and the heightof the reproductive tillers was higher than that of the vegetative tillers. The length of therhizome was sand soil >inter-forest sand soil>meadow soil>medium saline alkalize soil. The1st age and 2nd age class tillers were all dominant, the 3th and 4th age class tillers were the least,and the length of the rhizome was all increasing age structure. The storage of dry matter wassand soil >meadow soil>inter-forest sand soil >medium saline alkalize soil, and decreased asthe age class increased. There were four age classes of buds in the four habitats, and thenumber of the buds was meadow soil >sand soil >inter-forest sand soil >medium salinealkalize soil, and zero age class and 1st age class tillers were all dominant. The flower branchrates of the L.chinesis populations were all low, and the flower branch rate was all mediumsaline alkalize soil >meadow soil >inter-forest sand soil > sand soil. The height of the tillers,the length of spikes, the number of spikelets and the number of florets per spike and theweight of 1000 seeds were all sand soil >inter-forest sand soil>meadow soil>medium salinealkalize soil.