Yu Chengsong and his composite oil print works were I first known to the art circle in 1993 when he published a 35-volum painting album on Chinese landscape. The album, printed in six languages including Chinese, Engl...Yu Chengsong and his composite oil print works were I first known to the art circle in 1993 when he published a 35-volum painting album on Chinese landscape. The album, printed in six languages including Chinese, English, Japanese and French, was distributed worldwide. In order to create this album, Yu traveled across the country on his own expenses. He painted the most marvelous and beautiful landscapes in China,展开更多
Successional and seasonal effects on soil microbial and enzymatic properties were studied in Chinese pine (Pinus tabu- laeformis) plantations in an age sequence of 3-, 7-, 13-, 21- and 28-year-old in northern Ziwuling...Successional and seasonal effects on soil microbial and enzymatic properties were studied in Chinese pine (Pinus tabu- laeformis) plantations in an age sequence of 3-, 7-, 13-, 21- and 28-year-old in northern Ziwuling region in the middle of Loess Plateau, China. The results indicated that plantation age and season affected soil microbial and enzymatic parameters significantly. Soil organic C, total N, microbial biomass C, microbial quotient, basal respiration, dehydrogenase, N-α-benzoyl-L-argininamide (BAA)-protease, urease and β-glucosidase increased quickly and tended to be highest at PF21 (21-year plantation), thereafter they remained nearly at a constant level, whereas the metabolic quotient (qCO 2 ) showed an initial increase and then decreased gradually. Measures of these soil properties showed significant seasonal fluctuations except for organic C and total N, which were found to be relatively stable throughout the study period, and the seasonal distributions were autumn > spring > summer > winter for microbial biomass C, microbial quotient, dehydrogenase, and β-glucosidase; autumn > summer > spring > winter for BAA-protease and urease; and summer > autumn > spring > winter for basal respiration and qCO 2 . Significant season × age interaction was observed for biomass C, basal respiration, dehydrogenase and BAA-protease.展开更多
Dendroclimatological techniques were employed to investigate the relationship between Chinese Pinus(Pinus tabulaeformis Carr.) growth and climatic variability in the Mt.Yishan region of Shandong Province, China, over ...Dendroclimatological techniques were employed to investigate the relationship between Chinese Pinus(Pinus tabulaeformis Carr.) growth and climatic variability in the Mt.Yishan region of Shandong Province, China, over the past253 years. Using regression analysis, the wetness index(WI)was reconstructed for the Mt. Yishan area for the period1755–2007 AD based on tree-ring widths; predictor variables accounted for 40 % of the variance. The reconstructed timeseries displayed an increasing trend after the late 1960 s. Both the estimated and the observed WI for May–August were better correlated with precipitation than temperature during the period 1958–2007 AD, indicating that the contribution of precipitation to the WI was larger than temperature in the study area. The reconstructed WI was compared with the dryness/wetness index of China and land areas that were affected by droughts and floods using the agricultural statistics for Shandong Province. In addition, the WI time-series corresponded well with the peanut yield in Shandong Province at high frequency, which may be reasonable in the context of agriculture in Shandong. The 3-, 5- to 6- and 9- to10-year periodicities detected in the time-series suggested that the reconstructed WI in the Mt. Yishan area may be related to large-scale climate variations.展开更多
文摘Yu Chengsong and his composite oil print works were I first known to the art circle in 1993 when he published a 35-volum painting album on Chinese landscape. The album, printed in six languages including Chinese, English, Japanese and French, was distributed worldwide. In order to create this album, Yu traveled across the country on his own expenses. He painted the most marvelous and beautiful landscapes in China,
基金Supported by the National Natural Science Foundation of China (Nos. 41171154 and 41021091)the National KeyTechnologies R&D Program of China (Nos. 2011BAK12B05 and 2011BAK12B08)+2 种基金the Program for New Century ExcellentTalents in University (No. NECT-09-0449)the Discipline Innovation S&T Program in Higher Learning Institutions(111 Program)the Ministry of Education & the State Administration of Foreign Experts Affairs, China (No. B06026)
文摘Successional and seasonal effects on soil microbial and enzymatic properties were studied in Chinese pine (Pinus tabu- laeformis) plantations in an age sequence of 3-, 7-, 13-, 21- and 28-year-old in northern Ziwuling region in the middle of Loess Plateau, China. The results indicated that plantation age and season affected soil microbial and enzymatic parameters significantly. Soil organic C, total N, microbial biomass C, microbial quotient, basal respiration, dehydrogenase, N-α-benzoyl-L-argininamide (BAA)-protease, urease and β-glucosidase increased quickly and tended to be highest at PF21 (21-year plantation), thereafter they remained nearly at a constant level, whereas the metabolic quotient (qCO 2 ) showed an initial increase and then decreased gradually. Measures of these soil properties showed significant seasonal fluctuations except for organic C and total N, which were found to be relatively stable throughout the study period, and the seasonal distributions were autumn > spring > summer > winter for microbial biomass C, microbial quotient, dehydrogenase, and β-glucosidase; autumn > summer > spring > winter for BAA-protease and urease; and summer > autumn > spring > winter for basal respiration and qCO 2 . Significant season × age interaction was observed for biomass C, basal respiration, dehydrogenase and BAA-protease.
基金supported by the Chinese Academy of Sciences (KZZD-EW-04-01)the CAS/SAFEA International Partnership Program for Creative Research Teams (KZZDEW-TZ-03)+1 种基金the Program of State Key Laboratory of Loess and Quaternary Geology (SKLLQG)the National Natural Science Foundation of China (40771217)
文摘Dendroclimatological techniques were employed to investigate the relationship between Chinese Pinus(Pinus tabulaeformis Carr.) growth and climatic variability in the Mt.Yishan region of Shandong Province, China, over the past253 years. Using regression analysis, the wetness index(WI)was reconstructed for the Mt. Yishan area for the period1755–2007 AD based on tree-ring widths; predictor variables accounted for 40 % of the variance. The reconstructed timeseries displayed an increasing trend after the late 1960 s. Both the estimated and the observed WI for May–August were better correlated with precipitation than temperature during the period 1958–2007 AD, indicating that the contribution of precipitation to the WI was larger than temperature in the study area. The reconstructed WI was compared with the dryness/wetness index of China and land areas that were affected by droughts and floods using the agricultural statistics for Shandong Province. In addition, the WI time-series corresponded well with the peanut yield in Shandong Province at high frequency, which may be reasonable in the context of agriculture in Shandong. The 3-, 5- to 6- and 9- to10-year periodicities detected in the time-series suggested that the reconstructed WI in the Mt. Yishan area may be related to large-scale climate variations.
