Shiyuchunbao is a new hybrid of early-mid maturity spring Chinese cabbage with growth period of 60-65 d, flat-topped head and yellow inner leaves, characterized with high quality and good marketability. It is highly r...Shiyuchunbao is a new hybrid of early-mid maturity spring Chinese cabbage with growth period of 60-65 d, flat-topped head and yellow inner leaves, characterized with high quality and good marketability. It is highly resistant to viral diseases, downy mildew and soft rot disease, and can be cultivated in Beijing, Hebai, Heilongjiang and Yunnan.展开更多
Rice leaffolder, Cnaphalocrocis medinalis, is one of the major foliage feeders found in the rice growing regions in India. When the crop was at maturity, numerous adults of rice leaffolder were found in the rice field...Rice leaffolder, Cnaphalocrocis medinalis, is one of the major foliage feeders found in the rice growing regions in India. When the crop was at maturity, numerous adults of rice leaffolder were found in the rice fields though the larval population gradually decreased, and no eggs were found on rice leaves. The population characteristics of C. medinalis were assessed based on the physiological age status of adults at different crop growth stages. Based on egg development within ovarioles, ovariole appearance number and colour of fat bodies, and characteristics of bursa copulatrix, physiological age status of the adults was described, which served as a basis for the determination of age composition. C. medinalis adults were found during the first week of August on rice plants, of which 44% were in Age 0 with immature ovaries, indicating immigrants. However, 28% adults each were at Ages 1-2 with developing ovaries, indicating local breeding population. The carryover and off-season survival of C. medinalis were also studied to determine the contribution of the alternative hosts in the population growth that helped in devising efficient management strategies. Rice was the most preferred host followed by Triticum aestivum, Echinochloa crusgulli and Brachiaria plantaginea. Various routes of the carryover of C. medinalis from season to season were discussed.展开更多
It is a key and difficult point in landscape engineering to keep higher survival rate of off-season cultivation.This paper takes widely-planted species such as Ginkgo biloba,Metasequoia glyptostroboides and Cedrus deo...It is a key and difficult point in landscape engineering to keep higher survival rate of off-season cultivation.This paper takes widely-planted species such as Ginkgo biloba,Metasequoia glyptostroboides and Cedrus deodara in Beijing Garden Expo for example,summarizes key off-season cultivation techniques in urban landscaping,elaborated key technical links such as seedling selection,cultivation techniques,after-cultivation maintenance,and provided useful references for the off-season cultivation in urban landscaping of north China.展开更多
The crop water stress index(CWSI)is a complex instrument to effectively monitor the degree of water stress of crops and provides guidance for timely irrigation.In an experiment utilizing the CWSI with off-season green...The crop water stress index(CWSI)is a complex instrument to effectively monitor the degree of water stress of crops and provides guidance for timely irrigation.In an experiment utilizing the CWSI with off-season green peppers planted in barrels in a greenhouse in Liaoning Province,Northeast China,this study monitors the sub-indexes--such as canopy temperature,environmental factors and yield--determines the changing law of each constituent,achieves an empirical model as well as a baseline formula for the canopy temperature of the peppers with a sufficient water supply,and verifies the rationality of the formula with corresponding experimental data.The results obtained by using the CWSI show that the optimal time to determine the water deficit for off-season green peppers is at noon,by measuring the diurnal variation in the peppers with different water supplies.There is a nonlinear relationship between the yield and the average CWSI at the prime fruit-bearing period;moreover,the optimal time to supply water for off-season green peppers comes when the average water stress index ranges between 0.2 and 0.4 during the prime fruiting stage,thereby ensuring a high yield.展开更多
According to Shanghai Apparel Association, CNY360 million was spent in Shanghai top 10 department stores in May 2011, edging down 5.2 per cent m/m (-16.9% y/y). We’ve seen slight growth in the retail volume of about 2.
湟水河流域分布着广泛的灌丛草地,其非生长季碳收支平衡对整个生态系统具有重要意义,但目前对灌丛草地生态系统非生长季碳通量的动态变化及其与环境因子间的关系知之甚少。因此,该研究基于涡度观测系统,探讨湟水河流域灌丛草地生态系统...湟水河流域分布着广泛的灌丛草地,其非生长季碳收支平衡对整个生态系统具有重要意义,但目前对灌丛草地生态系统非生长季碳通量的动态变化及其与环境因子间的关系知之甚少。因此,该研究基于涡度观测系统,探讨湟水河流域灌丛草地生态系统碳通量特征及其主要影响因子。研究结果表明:研究区非生长季净生态系统碳交换量(NEE)呈明显的“U”型变化曲线,白天多为碳吸收,夜间为碳排放,日间碳吸收峰值出现在12:00-15:00之间,研究期间各月累计NEE均为负值。研究期间温度(空气温度、土壤温度)、相对湿度、饱和水汽压差和光合有效辐射均对NEE产生显著影响。此外,灌丛草地生态系统对温度较为敏感,在整个非生长季光合作用均较为明显,整个非生长季灌丛草地生态系统NEE累计为-376.938 g CO_(2)/m^(2),是一个弱的碳汇。展开更多
基金Supported by Science and Technology Support Program of Shijiazhuang City(161490152A)~~
文摘Shiyuchunbao is a new hybrid of early-mid maturity spring Chinese cabbage with growth period of 60-65 d, flat-topped head and yellow inner leaves, characterized with high quality and good marketability. It is highly resistant to viral diseases, downy mildew and soft rot disease, and can be cultivated in Beijing, Hebai, Heilongjiang and Yunnan.
基金supported by Indian Council of Agricultural Research, National Agricultural Innovative Project (Grant No.C2046)
文摘Rice leaffolder, Cnaphalocrocis medinalis, is one of the major foliage feeders found in the rice growing regions in India. When the crop was at maturity, numerous adults of rice leaffolder were found in the rice fields though the larval population gradually decreased, and no eggs were found on rice leaves. The population characteristics of C. medinalis were assessed based on the physiological age status of adults at different crop growth stages. Based on egg development within ovarioles, ovariole appearance number and colour of fat bodies, and characteristics of bursa copulatrix, physiological age status of the adults was described, which served as a basis for the determination of age composition. C. medinalis adults were found during the first week of August on rice plants, of which 44% were in Age 0 with immature ovaries, indicating immigrants. However, 28% adults each were at Ages 1-2 with developing ovaries, indicating local breeding population. The carryover and off-season survival of C. medinalis were also studied to determine the contribution of the alternative hosts in the population growth that helped in devising efficient management strategies. Rice was the most preferred host followed by Triticum aestivum, Echinochloa crusgulli and Brachiaria plantaginea. Various routes of the carryover of C. medinalis from season to season were discussed.
文摘It is a key and difficult point in landscape engineering to keep higher survival rate of off-season cultivation.This paper takes widely-planted species such as Ginkgo biloba,Metasequoia glyptostroboides and Cedrus deodara in Beijing Garden Expo for example,summarizes key off-season cultivation techniques in urban landscaping,elaborated key technical links such as seedling selection,cultivation techniques,after-cultivation maintenance,and provided useful references for the off-season cultivation in urban landscaping of north China.
基金The authors express appreciation for the financial support granted by the Education Department of Liaoning Province,China(Project No.L2012239)and the Ministry of Agriculture,China(Project No.201303125)We also thank Dr.Wang Yingkuan for his valuable suggestions for improving this paper and Dr.Cheryl Rutledge(Florida,USA)for her English editorial assistance.
文摘The crop water stress index(CWSI)is a complex instrument to effectively monitor the degree of water stress of crops and provides guidance for timely irrigation.In an experiment utilizing the CWSI with off-season green peppers planted in barrels in a greenhouse in Liaoning Province,Northeast China,this study monitors the sub-indexes--such as canopy temperature,environmental factors and yield--determines the changing law of each constituent,achieves an empirical model as well as a baseline formula for the canopy temperature of the peppers with a sufficient water supply,and verifies the rationality of the formula with corresponding experimental data.The results obtained by using the CWSI show that the optimal time to determine the water deficit for off-season green peppers is at noon,by measuring the diurnal variation in the peppers with different water supplies.There is a nonlinear relationship between the yield and the average CWSI at the prime fruit-bearing period;moreover,the optimal time to supply water for off-season green peppers comes when the average water stress index ranges between 0.2 and 0.4 during the prime fruiting stage,thereby ensuring a high yield.
文摘According to Shanghai Apparel Association, CNY360 million was spent in Shanghai top 10 department stores in May 2011, edging down 5.2 per cent m/m (-16.9% y/y). We’ve seen slight growth in the retail volume of about 2.
文摘湟水河流域分布着广泛的灌丛草地,其非生长季碳收支平衡对整个生态系统具有重要意义,但目前对灌丛草地生态系统非生长季碳通量的动态变化及其与环境因子间的关系知之甚少。因此,该研究基于涡度观测系统,探讨湟水河流域灌丛草地生态系统碳通量特征及其主要影响因子。研究结果表明:研究区非生长季净生态系统碳交换量(NEE)呈明显的“U”型变化曲线,白天多为碳吸收,夜间为碳排放,日间碳吸收峰值出现在12:00-15:00之间,研究期间各月累计NEE均为负值。研究期间温度(空气温度、土壤温度)、相对湿度、饱和水汽压差和光合有效辐射均对NEE产生显著影响。此外,灌丛草地生态系统对温度较为敏感,在整个非生长季光合作用均较为明显,整个非生长季灌丛草地生态系统NEE累计为-376.938 g CO_(2)/m^(2),是一个弱的碳汇。
