Are there some relationships among species diversity and soil chemical properties of high altitude natural grasslands? Plant community composition and chemical properties of soil samples were compared to investigate t...Are there some relationships among species diversity and soil chemical properties of high altitude natural grasslands? Plant community composition and chemical properties of soil samples were compared to investigate the relationship between soil and species diversity, and the richness in Tibetan alpine grasslands. Results showed that species diversity was significantly positively related to soil organic matter(SOM), total nitrogen(TN),available nitrogen(AN), total phosphorus(TP),available phosphorus(AP), and available potassium(AK) in the high alpine grasslands. Margalef's species richness index was also significantly positively related to SOM, TN, AN, and TP. Most soil chemical properties showed significantly positive correlation with species diversity and Margalef's richness index.Our results suggested that higher plant species richness index and diversity occurred in more fertile soil habitats in high altitude natural grassland community. In practice, fertilization management for the restoration of degraded grassland should be conducted with reference to the nutrient levels ofnatural grassland without the additional artificial fertilizer and with higher species-diversity and richness index.展开更多
The sequential reaction of the N,N,O-tridentate ligand HOC(CH2)5CH2N(Me)CH2CH2NMe2(LH)in diethyl ether with AlEtCl2 and MeLi afforded a lithium-aluminum complex containing a polymeric structure of one-dimensional chai...The sequential reaction of the N,N,O-tridentate ligand HOC(CH2)5CH2N(Me)CH2CH2NMe2(LH)in diethyl ether with AlEtCl2 and MeLi afforded a lithium-aluminum complex containing a polymeric structure of one-dimensional chain[{-LiOC(CH2)5CH2N(Me)CH2CH2NMe2}AlMe2CH3-}n](1),which was characterized by 1H,13C NMR spectra,elemental analyses and single-crystal X-ray diffraction analysis.Complex 1 crystallizes in triclinic,space group P1 with a=10.526(3),b=10.949(3),c=17.799(4)?,β=76.211(11)°,V=1915.3(8)?3,Dc=1.014 g·cm–3,F(000)=648 andμ=0.104 mm–1.In addition,the heterobimetallic complex 1 was used to catalyze the Meerwein-Ponndorf-Verley(MPV)reaction and exhibited excellent catalytic activities in good yield(up to 97%).展开更多
基金supported by Projects of Natural Science Foundation of China (Grant No. NSFC41371282)the Strategic Priority Research Program–Climate Change: Carbon Budget and Related Issues of the Chinese Academy of Sciences (CAS) (Grant No. XDA05050403)+1 种基金"100-Talents Program" of CAS, the Action Plan for West Development Project ofCAS (KZCX2-XB3-13)funds of State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment of CAS (Grant No. SKLLQG1123)
文摘Are there some relationships among species diversity and soil chemical properties of high altitude natural grasslands? Plant community composition and chemical properties of soil samples were compared to investigate the relationship between soil and species diversity, and the richness in Tibetan alpine grasslands. Results showed that species diversity was significantly positively related to soil organic matter(SOM), total nitrogen(TN),available nitrogen(AN), total phosphorus(TP),available phosphorus(AP), and available potassium(AK) in the high alpine grasslands. Margalef's species richness index was also significantly positively related to SOM, TN, AN, and TP. Most soil chemical properties showed significantly positive correlation with species diversity and Margalef's richness index.Our results suggested that higher plant species richness index and diversity occurred in more fertile soil habitats in high altitude natural grassland community. In practice, fertilization management for the restoration of degraded grassland should be conducted with reference to the nutrient levels ofnatural grassland without the additional artificial fertilizer and with higher species-diversity and richness index.
基金supported by the Inner Mongolia Natural Science Foundation(No.2017BS0202)the Major project of Ordos science and technology(No.2019ZD065)+1 种基金the Scientific Research Project of Ordos Institute of Technology(No.KYZD2018001)Colleges and Universities’Scientific Research Project(NJZY17401)。
文摘The sequential reaction of the N,N,O-tridentate ligand HOC(CH2)5CH2N(Me)CH2CH2NMe2(LH)in diethyl ether with AlEtCl2 and MeLi afforded a lithium-aluminum complex containing a polymeric structure of one-dimensional chain[{-LiOC(CH2)5CH2N(Me)CH2CH2NMe2}AlMe2CH3-}n](1),which was characterized by 1H,13C NMR spectra,elemental analyses and single-crystal X-ray diffraction analysis.Complex 1 crystallizes in triclinic,space group P1 with a=10.526(3),b=10.949(3),c=17.799(4)?,β=76.211(11)°,V=1915.3(8)?3,Dc=1.014 g·cm–3,F(000)=648 andμ=0.104 mm–1.In addition,the heterobimetallic complex 1 was used to catalyze the Meerwein-Ponndorf-Verley(MPV)reaction and exhibited excellent catalytic activities in good yield(up to 97%).
