天山南坡表土孢粉分析及其与植被的数量关系

本文通过对天山南坡各植被带的表土孢粉分析，研究了主要植物花粉的百分含量与其相应樾物盖度之间的数量关系，计算出不同植被带中主要植物的Ｒ值之比的比值。

NUMERICAL RELATIONSHIP BETWEEN THE SURFACE SPORE-POLLEN AND SURROUNDING VEGETATION ON THE SOUTHERN SLOPE OF TIANSHAN MOUNTAINS

The analyses on the surface spore-pollen in the each vegetation zone on the southern slope of the Tianshan Mountains are carried out, the numerical relationship between spore-pollen contents and coverages of the main plants is discussed, and the R values are calculated in the study. The results are as follows:(1) The spore-pollen of Chenopodtaceae, Ephedra and Artemista distribute extensively in all the vegetation zones, and the spore-pollen contents are high and with a transcendent representativeness, (2) The spore-pollen assemblage of the surface samples reflects the vegetation zones basically. The percentage of one kind of plant's po1len, however, can not exactly represent the plant coverage, which is main1y influenced by pollen spread and the dmerent pollen yield from dtherent plants. (3) In ecah vegetation zone, the R values from several samples are different. The relative R values of all the vegetation zones are calculated. In desert and desert-steppe zones, Rc:Re:Ra =1:1.8:1.6 (where, c is for Chenopodiaceae, e for Ephedra and a for Arlemista), in steppe zone, Rg:Ra:Rp:Ran=1:3:4.5:1.8 (where, g is for Gramineae, p for Potentilla and an for Androsace); and in alpine meadow zone, Rpo:Rg:Rcy=1:2.6:2.8 (where, po is for Polyonum, cy for Cyperceae). The results can provide the bases for representing the palaeo-vegetation situation by fossil pollen contents.