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Search Results: 1 - 10 of 24056 matches for " 曾招兵 "
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1984年以来广东水稻土ph变化趋势及影响因素
招兵,思坚,刘一锋,汤建东,张满红?
土壤 , 2014,
Abstract: 利用广东省1984年以来的长期定位监测数据,对全省20多年来的水稻土ph变化趋势进行了分析。结果表明:1984年以来,全省水稻土整体呈现明显的酸化趋势,期间水稻土ph下降了0.33单位,强酸和酸性土壤的分布频率呈明显的上升趋势,分别增加了3.2%和21.9%;珠三角地区的水稻土ph下降了0.54单位,明显高于其他区域。单施化肥使土壤ph降低,而长期坚持化肥结合有机肥施用可以提高土壤抵抗酸化的能力,提高水稻土ph。重化肥而轻有机肥是导致广东省水田土壤ph下降的主要原因,同时日益严重的酸雨也是加速土壤ph下降的重要因素。今后应重视施用有机肥,减缓水稻土的酸化进程。
施肥对铅镉污染土壤上芥菜铅镉含量及生理的影响
姚建武,王艳红,李盟军,唐明灯,艾绍英,招兵
中国生态农业学报 , 2010,
Abstract: 盆栽试验研究了不同化学肥料组合处理对铅镉污染土壤上芥菜(Brassicajuncea)Pb、Cd含量及其生理特性的影响。结果表明,与对照相比,各肥料处理在显著提高芥菜生物量的基础上,显著降低了芥菜地上部Cd含量(P<0.05),其中碳酸氢铵+磷酸二氢铵+硫酸钾处理的效果最佳,芥菜Cd含量仅为对照的41.0%;施肥处理提高了芥菜地上部Pb含量,但Pb没有健康风险;施肥提高了叶菜的叶绿素含量,但丙二醛、脯氨酸、细胞质膜透性与芥菜地上部Pb、Cd含量无显著相关性。重金属污染土壤施肥处理是一种值得推广的降低叶菜有害重金属含量的有效技术。
氮肥对镉在土壤-芥菜系统中迁移转化的影响
王艳红,艾绍英,李盟军,杨少海,姚建武,唐明灯,招兵
中国生态农业学报 , 2010,
Abstract: 以芥菜为研究对象,采用盆栽试验,探讨了不同用量的5种氮肥对污染农田土壤中镉(Cd)在土壤–根系–地上部迁移累积的影响。结果表明:5种氮肥均促进了芥菜根系对Cd的吸收,且根系Cd含量随施氮量的增加而增加;但根系吸收转运Cd的能力随氮肥施用量的增加呈先降后增的变化趋势。在≤200mg(N)·kg-1(土)的施氮水平下,CO(NH2)2和Ca(NO3)2处理能显著降低芥菜地上部Cd含量,降低幅度分别为13%~29%和24%~30%。在施氮量相同的条件下,NH4Cl和(NH4)2SO4显著降低了土壤pH,增加了土壤DTPA-Cd含量,促进了芥菜对Cd的吸收。本试验条件下,200mg(N)·kg-1(土)的CO(NH2)2在增加芥菜产量和降低芥菜地上部Cd含量等方面优于其他氮肥处理。
不同改良剂对镉污染土壤中小白菜吸收镉的影响
郭利敏,艾绍英,唐明灯,李盟军,姚建武,王艳红,招兵
中国生态农业学报 , 2010,
Abstract: 采用盆栽试验,研究了施用石灰、钙镁磷肥、泥炭、碱渣4种土壤改良剂对外加镉污染的赤红壤上小白菜产量、镉吸收量、土壤有效态镉及pH的影响。结果表明:外加1mg·kg-1和5mg·kg-1镉对小白菜生物量无显著影响,且1mg·kg-1镉对小白菜生长有一定的促进作用;施用改良剂对镉污染土壤上小白菜无显著增产效果。施用4种改良剂均能降低小白菜地上部镉含量,作用效果为石灰≈泥炭>碱渣>钙镁磷肥。不同改良剂对小白菜根部镉含量影响不同,泥炭和石灰在所有镉浓度下、钙镁磷肥在0和1mg·kg-1镉浓度下可显著降低根部镉含量,而碱渣无明显作用,种植两茬规律一致。土壤有效态镉含量与pH呈显著负相关;施用石灰、碱渣、钙镁磷肥使土壤pH显著升高,有效态镉含量显著降低,从而降低小白菜对镉的吸收;泥炭可显著提高土壤pH,虽降低土壤有效态镉作用效果不显著,但显著降低小白菜体内镉含量,这可能与土壤中形成难以被植物吸收的镉有机结合物有关。两茬蔬菜种植结果显示,施用后期改良剂对镉污染的抑制效果也较明显。
信息叠加法大田初步筛选镉铅低富集叶菜
唐明灯,艾绍英,李盟军,招兵,姚建武,王艳红?
土壤 , 2011,
Abstract: 为了降低cd、pb污染菜地的食物链风险,在cd、pb全量及田间管理等不一致的广州市城郊菜地,进行了2个大田小区试验来研究29种常见叶菜的cd、pb吸收特征,并通过信息叠加法来筛选cd、pb低富集叶菜。结果表明,供试叶菜地上部cd、pb含量都没有超过我国食品中污染物限量标准,cd在叶菜中的迁移能力较pb强;叶菜cd含量呈现科属亲缘特征,莴苣属和番薯属叶菜地上部cd含量显著高于芸苔属(p<0.05)。同时筛选到3种低cd叶菜和6种低pb叶菜,在广州近郊菜地种植,其可食部分cd、pb较低。
广东耕地土壤有机质的变化趋势及其驱动力分析
招兵,汤建东,刘一峰,张满红,林碧姗?
土壤 , 2013,
Abstract: 利用广东省1984—2010年的土壤长期定位监测数据,对全省20多年来的耕地土壤有机质变化趋势进行了分析。结果表明:1984—2010年,全省耕层土壤有机质含量总体表现稳定,但近年来呈下降趋势,尤其是珠三角地区较为明显。全省不同区域的有机质含量差异显著,粤东地区偏低,平均含量比粤北低22%。不同土壤类型的耕地有机质变化趋势亦有差别,赤红壤和紫色土耕地的有机质含量偏低,分别只有13.0g/kg和11.2g/kg,占耕地面积比例最大的水稻土近5年来有机质含量下降了1.5g/kg。对全省耕地有机质变化的驱动力分析表明,优质农田的流失、种植模式的变化是影响全省耕地有机质含量整体水平降低的原因之一。
广东稻田氮素径流流失特征
姚建武,宁建凤,李盟军,王荣辉,招兵,罗英健,艾绍英,李振森,陈位超,欧计寅
农业环境科学学报 , 2015, DOI: 10.11654/jaes.2015.04.018
Abstract: 2008-2012年间,对分布于粤中、粤北和粤西的增城、清远和高州三个稻田试验点进行了连续5年的径流养分定点监测试验,研究当地农户常规施肥模式下稻田氮素养分的径流流失特征及其潜在环境风险。径流监测结果表明,三个试验点的稻田径流事件主要发生在早稻季节。增城、清远和高州试验点施肥处理铵态氮浓度分别为0.05~25.05、0.02~19.83mg·L-1和0.02~55.4mg·L-1,总氮浓度分别为0.33~36.51、0.46~21.01mg·L-1和0.49~61.96mg·L-1。结果显示,施肥明显增加径流水铵态氮和总氮含量,施氮后10d内径流水铵态氮和总氮浓度均高于地表水Ⅴ类水标准(2.0mg·L-1),具有一定的环境污染风险;施氮对径流水硝态氮浓度具有一定影响,三个试验点径流水硝态氮浓度均在10mg·L-1的地表水标准限值内;稻田氮年流失负荷表现出时空差异性大的特点,增城、清远和高州试验点施肥处理总氮年流失负荷分别为24.31~53.68kg·hm-2、8.71~23.76kg·hm-2和13.32~88.16kg·hm-2,相应氮流失系数为1.4%~3.9%、0.1%~5.5%和0.9%~21.6%。不同稻季总氮流失分析显示,53%~86%的总氮流失负荷发生在早稻季,与本地区降雨时间分布有直接关系。
Changes and Driving Forces of Farmland Organic Matter in Guangdong Province, China
广东耕地土壤有机质的变化趋势及其驱动力分析

ZENG Zhao-bing,TANG Jian-dong,LIU Yi-feng,ZHANG Man-hong,LIN Bi-shan,
招兵
,汤建东,刘一峰,张满红,林碧姗

土壤 , 2013,
Abstract: The change of farmland organic matter was analyzed by using long-term monitoring data in Guangdong Province, South China. The results showed that farmland organic matter content in Guangdong Province did not change significantly from 1984 to 2010, but showed a decrease trend in last 5 years, especially for the farmland organic matter in the Pearl River Delta. There were significant differences in organic matter content between different regions: east Guangdong was 22% less than north Guangdong. Soil types affected the organic matter content. Organic matter content in farmland originated from Latosolic red soils and Purplish soils were lower, which were 13.0 g/kg and 11.2 g/kg respectively. The mean of organic matter content of paddy soil which was with the largest area decreased 1.5 g/kg in last 5 years. The decrease of farmland organic matter in Guangdong Province was mainly due to the loss of high-quality farmland and the change of planting model.
Preliminary screening for leaf vegetables with lower Cd or Pb contents by using informational superposition in fields
信息叠加法大田初步筛选镉铅低富集叶菜

TANG Ming-deng,AI Shao-ying,LI Meng-jun,ZENG Zhao-bing,YAO Jian-wu,WANG Yan-hong,
唐明灯
,艾绍英,李盟军,招兵,姚建武,王艳红

土壤 , 2011,
Abstract: To reduce the food chain risk for vegetable soils contaminated Cd,and/or Pb,two field trials were conducted to investigate Cd or Pb uptake by 29 varieties of familiar leaf vegetables and to screen leaf vegetables with lower Cd or Pb content by using the informational superposition method under the condition of suburb vegetable soils in Guangzhou City.The results showed that the shoot Cd or Pb content of tested vegetables was lower than the national maximum levels of contaminants in foods.Cd in the tissues o...
Effect of fertilization on Pb and Cd content, and on physiological property of mustard growing in soil polluted by Pb and Cd
施肥对铅镉污染土壤上芥菜铅镉含量及生理的影响

YAO Jian-Wu,WANG Yan-Hong,LI Meng-Jun,TANG Ming-Deng,AI Shao-Ying,ZENG Zhao-Bing,
姚建武
,王艳红,李盟军,唐明灯,艾绍英,招兵

中国生态农业学报 , 2010,
Abstract: A pot experiment was conducted to investigate the effects of the combined application of different fertilizers on the contents of Pb and Cd and on the physiological properties of mustard (Brassica juncea) in Pb and Cd polluted soils. The results show that fertilization treatments significantly decrease Cd uptake in mustard shoot, besides a significant mustard biomass increase compared with the control (P<0.05). Shoot Cd content under optimal combination of ammonium bicarbonate, ammonium dihydrogen phosphate and potassium sulfate treatment is only 41.0% that of the control. Fertilization increases the shoot Pb content of mustard, which is far lower than the standard of Pb content for the safe vegetable. Fertilizer application increases vegetable chlorophyll content, but with insignificant correlation between malondialdehyde (MDA), proline, cell membrane permeability and shoot Pb, Cd contents. Fertilization of heavy metal contaminated soils is a practicable technology for mitigating heavy metal content in shoots of leaf vegetables.
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