检索结果-南通市图书馆

Topsoil organic carbon mineralization and CO_2 evolution of three paddy soils from South China and the temperature dependence

引用

Journal of Environmental Sciences 2007年第3期19卷 319-326页

作者： ZHANG Xu-hui LI Lian-qing PAN Gen-xing Institute of Resources Ecosystem and Environment of Agriculture Nanjing Agricultural University Nanjing 210095 China.

Carbon mineralization and its response to climatic warming have been receiving global attention for the last decade. Although the virtual influence of temperature effect is still in great debate, little is known on the mineralization of organic carbon （SOC） of paddy soils of China under warming. SOC mineralization of three major types of China＇s paddy soils is studied through laboratory incubation for 114 d under soil moisture regime of 70% water holding capacity at 20℃ and 25℃ respectively. The carbon that mineralized as CO2 evolved was measured every day in the first 32 d and every two days in the following days. Carbon mineralized during the 114 d incubation ranged from 3.51 to 9.22 mg CO2-C/gC at 20℃ and from 4.24 to 11.35 mg CO2-C/gC at 25℃ respectively; and a mineralizable C pool in the range of 0.24 to 0.59 gC/kg, varying with different soils. The whole course of C mineralization in the 114 d incubation could be divided into three stages of varying rates, representing the three subpools of the total mineralizable C： very actively mineralized C at 1-23 d, actively tnineralized C at 24--74 d and a slowly mineralized pool with low and more or less stabilized C mineralization rate at 75-114 d. The calculated Q10 values ranged from 1.0 to 2.4, varying with the soil types and N status. Neither the total SOC pool nor the labile C pool could account for the total mineralization potential of the soils studied, despite a well correlation of labile C with the shortly and actively mineralized C, which were shown in sensitive response to soil warming. However, the portion of microbial C pool and the soil C/N ratio controlled the C mineralization and the temperature dependence. Therefore, C sequestration may not result in an increase of C mineralization proportionally. The relative control of C bioavailability and microbial metabolic activity on C mineralization with respect to stabilization of sequestered C in the paddy soils of China is to be further studied.

关键词： C mineralization carbon pool laboratory incubation paddy soil soil warming

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impacts of increasing maize stalk retention amount on soil respiration and temperature sensitivity

引用

International Journal of Agricultural and Biological Engineering 2022年第2期15卷 135-141页

作者： Hongfang Yuan Gang Wang Dongyan Huang Stephan Glatzel Jian Zhuang Honglei Jia College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Department of Geography and Regional Research University of ViennaVienna 1090Austria Key laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China

Conservation tillage with maize stalk retention is an effective method to replenish soil *** availability plays a major role in the control of soil respiration(SR).However,it is not known how different degrees of maize stalk retention control SR and its temperature sensitivity(Q_(10)).To investigate the effect of maize stalk retention amount on SR and Q_(10),four maize(Zea mays L.)stalk retention treatments,including(i)control treatment(CT)without maize stalk retention,(ii)standing maize stalk retention(SCR),(iii)partial maize stalk retention with‘three-year cycle’(TYR)and(iv)chopped maize stalk retention(CCR)was set *** order to investigate the differences in soil nutrient,soil organic carbon(SOC)quality and soil microbial biomass among four treatments,soil analysis with 6 replicates was *** experimental results showed that SR rates were 1.07,0.88,0.59 and 0.37 g/kg of dry soil,and the average Q_(10)was 1.535,1.585,1.62 and 1.725 for CT,SCR,TYR and CCR,*** maize stalk retention led to the reduction of soil microbial abundance and labile carbon *** correlation analysis showed that soil microbial abundance had a positive correlation with SR,while labile carbon fraction had a negative correlation with Q_(10).In short,increasing the amount of maize stalk retention decreases SR while increasing Q_(10)in northeast *** research could provide a reference value for balancing carbon sequestration and carbon decomposition in farming practice.

关键词： stalk management soil nutrient carbon composition microbial biomass laboratory incubation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effects of soil amendment and foliar selenium applications on cadmium immobilization in soil and accumulation in wheat

引用

Pedosphere 2024年第6期34卷 1123-1135页

作者： Qiqi LIU Tianyi WU Qiugang WU Chen ZHANG Dafu WU Lihao ZHANG Jing ZHOU Huan ZHANG Jun ZHOU School of Resources and Environment Henan Institute of Science and Technology Key laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences University of Chinese Academy of Sciences Jiangsu Design Institute of Geology for Mineral Resources National Engineering and Technology Research Center for Red Soil Improvement Red Soil Ecological Experiment Station Chinese Academy of Sciences Sino-Japan Friendship Center for Environmental Protection

Wheat cadmium(Cd) contamination is one of the environmental and agricultural concerns worldwide. Here, the effects of applications of foliar selenium(Se) and soil amendments(lime, mixture of biofuel ash and sodium sulfide(DSO), and mixture of iron mine tailing and alkali lignin(MX)) on soil Cd fractions and wheat Cd accumulation were studied using laboratory incubation, greenhouse pot, and field plot experiments. In the laboratory incubation experiment, lime and MX applications significantly increased soil pH, DSO application significantly decreased soil p H, while all the three amendments significantly reduced soil bioavailable Cd fractions by 16%–21% compared to the control without any amendment. Foliar Se application significantly increased the growth and yield of the high-Cd-accumulating cultivar(Puxing5). In the greenhouse experiment, lime and MX applications considerably decreased grain Cd concentration by 55% and 47%, respectively, for Puxing5 and by 24% and 26%, respectively, for the low-Cd-accumulating cultivar(Zhoumai30). In the field experiment, grain Cd concentration was significantly reduced by 68% and 72% by lime and MX applications, respectively, for Puxing5. Application of DSO also significantly reduced grain Cd concentration by 58% for Puxing5 and 25% for Zhoumai30 in the greenhouse experiment, but increased grain Cd concentration by 22% for Puxing5 in the field experiment. Our results implicate that laboratory incubation and greenhouse experiment results are necessary to be verified in field, and foliar Se application is recommended when considering both financial costs and production safety.

关键词： bioavailable Cd fraction cadmium contamination field plot experiment grain Cd concentration laboratory incubation pot experiment

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：