Results 21 to 30 of about 1,103,180 (167)
Shuitu Baochi Xuebao, 2005 研究了次降雨过程中红壤小流域5种不同土地利用方式土壤N,P养分流失特征。结果表明,在降雨后,花生地、花-橘间作、橘园、板栗园和水田5种利用方式表层土壤N,P养分含量均有不同程度下降,其中花生地N,P含量下降最为明显,水田N,P含量降幅则最小;不同形态养分平均降幅依次为有效氮(5.49%)、有效磷(5.25%)、全氮(1.45%)、全磷(0.59%)。各样地地表径流中水溶态N,P养分含量花生地明显高于其他样地,而泥沙中N,P养分含量则以水田最高;各样地侵蚀泥沙中N,P养分有明显的富集现象,板栗园和橘园N ...
王晓龙 李辉信 胡锋 秦江涛 张斌
doaj +2 more sources
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT The pollution caused by antibiotics to aquatic ecosystems is becoming increasingly serious, thus more effective treatment methods are urgently required. Although the photocatalytic degradation behavior of tetracycline (TC) is relatively well understood, sulfamethoxazole (SMZ), an emerging pollutant originating from large‐scale livestock ...
Yihang Yang +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2005 采用室内分根营养液培养及PEG模拟水分胁迫的方法,研究不同氮素形态(NH4 -N、NO3--N、NH4 -N/NO3--N比为50/50)对水稻局部根系遭遇水分胁迫后的生物学响应状况。结果表明,在非水分胁迫的条件下,供应NO3--N营养相对促进分蘖期水稻的根系发育,而供应NH4 -N营养相对促进分蘖期水稻的地上部发育;在局部根系受到水分胁迫的条件下,NH4 -N和NO3--N混合营养水稻生物量增量分别比全NO3--N和全NH4 -N营养水稻高31.7%和37.7%,其中地上部生物量增量也分别比全NO3--
周毅 郭世伟 沈其荣
doaj +2 more sources
Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source
OnomázeinAlthough å§å§ /jiejie/ (“elder sister”) and 妹妹 /meimei/ (“younger sister”) are basic relatives' terms of the nuclear and consanguinity kinship, they mean a big challenge when they are translated into Spanish because of the linguistic and cultural differences and defaults between the Chinese and the Spanish.
openaire +1 more source
Wildlife Letters, Volume 4, Issue 3, Page 139-148, September 2026.Asiatic black bears in Russia face conservation threats such as habitat destruction and fragmentation, which exacerbate food shortages caused by crop failures. This study explores an innovative approach to rehabilitating bears that abandon hibernation in mid‐winter due to extreme exhaustion by providing supplemental food near their den sites.
Sergey A. Kolchin +2 more
wiley +1 more source
Shuitu Baochi Xuebao, 2004 对北京北部山区板栗林主要养分元素积累与分配的研究结果表明:22年生板栗林的生物量为38638kg/hm2,生物量在干、枝、叶、花、果、果苞及根中的分配比例为52.18∶21.82∶3.70∶2.26∶2.65∶2.07∶15.33。板栗林5种主要养分元素N、P、K、Ca和Mg的贮存量为315.38kg/hm2,不同器官中5种养分元素贮存量排序为干>枝>根>叶>花>果苞>果。土壤层中5种养分元素贮存总量为206427.59kg/hm2,有效养分元素贮存量为16188 ...
薛智德 刘世海 余新晓
doaj +2 more sources
紫色丘陵区县级农田养分平衡与土壤养分变化趋势研究—以四川省犍为县为例
Shuitu Baochi Xuebao, 2003 根据有关统计资料、实地调查和土壤分析数据,采用典型抽样法,以犍为县为例,研究了近14年(1985～1999年)来该县农田养分平衡与土壤养分变化的趋势。结果表明:20世纪90年代以后,农田氮素由持平转向盈余;磷素全面扭亏为盈,盈余率已超出50%;钾素一直处于大比例亏缺状态。通过1981年和2000年的土壤主要养分含量对比研究,获得了近20年来土壤养分动态变化的基本趋势,以及农田养分平衡状况对土壤养分变化的影响,并针对农田养分平衡与土壤养分变化的趋势 ...
李廷轩 马国瑞 等
doaj
World Medical &Health Policy, Volume 18, Issue 3, September 2026.ABSTRACT Confrontational violence still puts catastrophic burdens on children, with 2024 being the highest recorded levels of displacement, malnutrition, injury, and deprivation in contemporary humanitarian history. Children's surgical care is still grossly underrepresented in health responses worldwide in the prevention of avoidable deaths and long ...
Gaurav Chanderprakash Mittal +4 more
wiley +1 more source
Shuitu Baochi Xuebao, 2001 土壤养分流失是农田非点源污染的主要形式。以长江三峡库区典型小流域为研究区域 ,根据土壤养分流失规律与土壤侵蚀量预测结果 ,以及表土中养分含量 ,像元土壤侵蚀量和泥沙对养分的富集比 ,建立了可与 GIS结合的侵蚀泥沙携带养分量预测模式。运算结果显示 ,小流域有机质、氮、磷、钾流失总量分别为 5 0 9.8,47.1,14.6 ,1137.4t,平均 30 .5 ,2 .8,0 .9,6 8.1t/ km2。根据正常施肥水平及有机质累积率草拟的土壤养分流失分级标准来判断 ,三峡库区小流域养分流失量 ...
蔡崇法 丁树文 等
doaj +2 more sources