CAJ | 학술논문

通过对中国西部地区新疆、柴达木盆地、甘肃、西藏等地148种植物叶片稳定碳同位素组成分析，讨论了其与环境因子之间的关系.结果表明中国西部地区优势建群种δ13 C为-10.5‰～-32.6‰，主要以C3植物为主，少量C4植物. C3植物的δ13 C为-22.8‰～-32.6‰，平均为-26.9‰； C4植物的δ13 C为-10.5‰～-15.8‰，平均为-13.1‰.在生长季节， C3植物的δ13 C受降水量、湿度的影响较大，随降水量减少，δ13 C逐渐偏重，随相对湿度增加，δ13 C逐渐偏轻.温度对植物碳同位素组成的影响较为复杂，年均温度在0～4?C时植物碳同位素组成最轻，而随温度从4?C升高、从0?C降低时，植物碳同位素组成均呈现偏重的趋势.中国西部地区植物碳同位素组成受多种因素同时作用，植物生长期降水量和温度对植物碳同位素组成影响较大.
통과대중국서부지구신강、시체목분지、감숙、서장등지148충식물협편은정탄동위소조성분석，토론료기여배경인자지간적관계.결과표명중국서부지구우세건군충δ13 C위-10.5‰～-32.6‰，주요이C3식물위주，소량C4식물. C3식물적δ13 C위-22.8‰～-32.6‰，평균위-26.9‰； C4식물적δ13 C위-10.5‰～-15.8‰，평균위-13.1‰.재생장계절， C3식물적δ13 C수강수량、습도적영향교대，수강수량감소，δ13 C축점편중，수상대습도증가，δ13 C축점편경.온도대식물탄동위소조성적영향교위복잡，년균온도재0～4?C시식물탄동위소조성최경，이수온도종4?C승고、종0?C강저시，식물탄동위소조성균정현편중적추세.중국서부지구식물탄동위소조성수다충인소동시작용，식물생장기강수량화온도대식물탄동위소조성영향교대.
The stable carbon isotope composition(δ13C) of 148 plant species had been measured in Western China, and the carbon isotope values for C3 plants were discussed with relevance to climatic environment factors (especially temperature and humidity). The results showed that the δ13C values for plant species in Western China as a whole ranged from -10.5‰ to -32.6‰, with C3 plants being dominant in Western China and some C4 plant species being a minor position. The δ13C values of C3 plant species ranged from -22.8‰ to-32.6‰ with a mean of -26.9‰, while that of C4 plant species ranged from -10.5‰ to -15.8‰ with a mean of -13.1‰. Correlation analysis also showed a week relationship between the carbon isotope compositions of plants and the annual mean precipitation, total precipitation in the growing season as influenced by multiple environmental factors and different plant species. The carbon isotope composition of plants was lighter with increasing precipitation, while there was a complete relationship between the δ13C values of C3 plants and the annual temperature. Lighter isotopic values of plants was in the range of 0～4?C, and became heavier with temperature increasing from 4?C and decreasing from 0?C. The carbon isotope composition in plants was affected by many factors simultaneously and precipitation and temperature in the growing seasons had a great influence on the carbon isotope composition in plants.