Water was a key factor restricting the plantation in sandy areas. Foliar δ^(13)C value regarded as an indicator of longterm water use efficiency(WUE) of plants was generally used to evaluate the adaptability of plant...Water was a key factor restricting the plantation in sandy areas. Foliar δ^(13)C value regarded as an indicator of longterm water use efficiency(WUE) of plants was generally used to evaluate the adaptability of plants to arid and semi-arid environment. In Horqin sandy land of China, the foliar δ^(13)C values of 114 species in 35 families naturally growing in the area, and 15 species of sand-fixing trees and shrubs were measured and analyzed in 2012. The results showed that 97 species in all 114 species were C_3 plants and only 17 species were C_4 plants. Most C_4 plants belonged to Gramineae family. The foliar δ^(13)C value of C_3 plants was between -25.000 and -31.075‰ with an average of-28.226‰, while those of C_4 plants between -12.578 and -16.334‰, with an average of -13.678‰. The δ^(13)C values of mature leaves collected in August were averagely 0.85‰ less than that of juvenile leaves collected in June. The foliar δ^(13)C values and WUE of 15 sand-fixing tree species in Horqin sandy land ranked in the order as: S.vulgaris >H.rhamnoides >C.ovata >P.mongolica >T.chinensis >R.typhina >S.matsudana >E.angustifolia >U.pumila >S.gordejevii >X.sorbifolia >C.microphylla >H.fruticosum >C.korshinskii >E.bungeanus.展开更多
Total organic carbon (TOC) content correlates very well with hydrogen index (HI) in the sedi- ments of RH core in the Zoig Basin.And the δ^(13)C values of TOC become more positive while both TOC content and HI declin...Total organic carbon (TOC) content correlates very well with hydrogen index (HI) in the sedi- ments of RH core in the Zoig Basin.And the δ^(13)C values of TOC become more positive while both TOC content and HI decline,indicating the subaerial exposure or the lake sedimonts approaching to the water lev- el.On the basis of the above,RH core sediments are divided into 23 climatic fluctuation stages, including 12 warm-humid stages and 11 dry-cold stages,which can he compared with oceanic oxygen isotope stages,loess profile and polar ice-core records.展开更多
基金Supported by the Scientific Research Project of Hebei Higher Education(QN2015306)National Key Technology Research and Development Program of China during the 12th Five-Year Plan(2012BAD16B0302)
文摘Water was a key factor restricting the plantation in sandy areas. Foliar δ^(13)C value regarded as an indicator of longterm water use efficiency(WUE) of plants was generally used to evaluate the adaptability of plants to arid and semi-arid environment. In Horqin sandy land of China, the foliar δ^(13)C values of 114 species in 35 families naturally growing in the area, and 15 species of sand-fixing trees and shrubs were measured and analyzed in 2012. The results showed that 97 species in all 114 species were C_3 plants and only 17 species were C_4 plants. Most C_4 plants belonged to Gramineae family. The foliar δ^(13)C value of C_3 plants was between -25.000 and -31.075‰ with an average of-28.226‰, while those of C_4 plants between -12.578 and -16.334‰, with an average of -13.678‰. The δ^(13)C values of mature leaves collected in August were averagely 0.85‰ less than that of juvenile leaves collected in June. The foliar δ^(13)C values and WUE of 15 sand-fixing tree species in Horqin sandy land ranked in the order as: S.vulgaris >H.rhamnoides >C.ovata >P.mongolica >T.chinensis >R.typhina >S.matsudana >E.angustifolia >U.pumila >S.gordejevii >X.sorbifolia >C.microphylla >H.fruticosum >C.korshinskii >E.bungeanus.
基金the National Natural Science Foundation of Chinathe National Climbing Programme
文摘Total organic carbon (TOC) content correlates very well with hydrogen index (HI) in the sedi- ments of RH core in the Zoig Basin.And the δ^(13)C values of TOC become more positive while both TOC content and HI decline,indicating the subaerial exposure or the lake sedimonts approaching to the water lev- el.On the basis of the above,RH core sediments are divided into 23 climatic fluctuation stages, including 12 warm-humid stages and 11 dry-cold stages,which can he compared with oceanic oxygen isotope stages,loess profile and polar ice-core records.
