黄淮冬麦区气象因子与小麦晚霜冻害关系研究——以商丘市为例   总被引：1，自引：0，他引：1  

刘红杰  武永峰  任德超  倪永静  胡新 《中国农业气象》2017,(8):517-525

基于1956-2015年商丘市气象数据和霜冻害资料,研究黄淮冬麦区商丘市气象因子与霜冻害的关系,以及气温、地温、相对湿度、风速与草面温度的偏相关和多元线性回归关系。结果表明:随着全球气温变暖,商丘市冬春季积温以4.35℃·d·a~(-1)的速率逐年增加;晚霜冻害除受冷空气活动影响外,与前期积温和降水量密切相关,冬春季积温偏高或降水量偏少的情况下易发生晚霜冻害;随着小麦幼穗的发育,其对低温的敏感度增加,且可引起霜冻害的最低温度有逐渐升高的趋势;气温、地表温度、平均相对湿度、平均风速与草面温度呈极显著相关(P0.01),偏相关系数的大小表现为地表温度气温平均相对湿度平均风速,可见,除气温、地表温度外,平均相对湿度、平均风速也对霜冻害的发生及轻重程度起关键作用;各因子与草面温度可用模型表述为Y=0.558ST+0.482AT+0.087RH+1.304WS-12.704,经检验,线性回归方程成立,可通过该模型对草面温度进行监测,并为未安装草面温度传感器的地区提供可靠的冻害评估结果。  相似文献   

锡林郭勒草原产草量与碳储量的遥感估测     

吕海燕  徐斌  杨秀春  金云翔  李金亚 《安徽农业科学》2010,38(32):18466-18468

利用锡林郭勒草原2008年生长季159个地面实测样方数据和2008年空间分辨率500 m MODIS植被指数NDVI数据以及同期的研究区气象数据,在对各种遥感估产模型进行对比分析的基础上,利用遥感—气象综合模型对锡林郭勒草原产草量的空间分布与碳储量进行了遥感估测研究,结果表明,2008年锡林郭勒盟产草量鲜重估计值为59 355 014.0 t,平均单产为257 607.0 kg/km2,产草量空间呈现自西向东逐渐增加的趋势;锡林郭勒草原地上植被的碳储量为8 408 187.5 t,不同草原类型的碳储量存在显著差异。上述研究成果可以为指导锡林郭勒草原的畜牧业生产、开展草原区气候变化规律研究提供科学依据。  相似文献   

不同生草处理对雪青梨光合特性的影响     

赵明新  孙文泰  张江红 《安徽农业科学》2010,38(33):18689-18690,18692

[目的]研究不同生草制度对雪青梨光合特性的影响,选择适合雪青梨行间种植的草种。[方法]以雪青梨为试材,利用CIRAS-2便携式光合作用测定系统测定了4种生草制度下,雪青梨的净光合速率变化和光合作用日变化。[结果]雪青梨的净光合速率（Pn）日变化呈单峰型,不同生草制度下雪青梨的Pn不同,行间种植三叶草处理的雪青梨叶片的Pn最高,为11.08μmol/（m^2·s）,其次为黑麦草,为10.48μmol/（m^2·s）,清耕条件下最低,为9.28μmol/（m^2·s）;不同生草模式下清耕的气孔阻止值最大（0.349 5）,黑麦草的最小（0.234 8）;三叶草的水分利用率最大（2.848）,清耕的最小（2.048）。[结论]该研究为梨树果园行间生草大面积的推广提供了理论依据。  相似文献   

Nitrate Poisoning in Horses Associated With Ingestion of Forage and Alfalfa     

Hasan H. Oruc  Ahmet Akkoc  Ilknur Uzunoglu  Engin Kennerman 《Journal of Equine Veterinary Science》2010

This report describes nitrate poisoning observed in thoroughbred mares. Nine horses died at a farm in Bursa, Turkey, between February and April of 2008. Five of them were pregnant. Clinical findings developed over a short period and included severe abdominal pain, limited response to analgesics and antispasmodics, diarrhea, shallow and rapid breathing, tachycardia, blue-brown discoloration of the mucosal membranes, tremors, ataxia, convulsions before death, and abortion in the pregnant mares. The main postmortem finding was chocolate brown–colored blood as well as congestion and inflammation of the intra-abdominal organs. Uterine rupture, colonic ruptures, and torsio uteri were seen in the pregnant mares. Stomach and intestinal ruptures were seen in four nonpregnant mares. High nitrate concentrations were determined in some grass and alfalfa samples used to feed the animals. Nitrate poisoning is considered to be very rare in horses, but, in this case, the clinical symptoms, postmortem findings, and nitrate levels in the collected samples supported nitrate and nitrite poisoning as the cause of deaths.  相似文献   

棉子糖对草鱼生长性能和血清生化指标的影响     

邱燕  叶元土  蔡春芳  马红  肖顺应  代小芳  顾东 《动物营养学报》2010,22(2)

为了研究棉子糖对草鱼生长和血清生化指标的影响,选取初均重(69.51±6.29)g的草鱼288尾,随机分为6组,每组3个重复,每个重复16尾鱼.对照组饲喂基础饲料,试验组分别饲喂含200、400、800、1200和2000 mg/kg棉子糖的试验饲料,试验期为70 d.结果显示:与对照组相比,1)添加棉子糖能够提高草鱼的特定生长率,降低饲料系数,其中1200 mg/kg组与其余各组差异显著(P<0.05);2)各试验组蛋白质沉积率均有所提高,但无显著差异(P>0.05);脂肪沉积率除400 mg/kg组外,其余各试验组均显著升高(P<0.05);尤以1200 mg/kg组的蛋白质沉积率和脂肪沉积率最高;3)各试验组血清甘油三酯含量显著升高(P<0.05),高密度脂蛋白、低密度脂蛋白含量均显著降低(P<0.05).由此得出:1)棉子糖能够提高草鱼对饲料的吸收利用,增强鱼体对脂肪的吸收并节约蛋白质,从而促进草鱼生长;2)棉子糖可以明显的起到调节草鱼脂质代谢的作用.  相似文献   

诸暨私家庭院草坪的建植     

王红霞 《农业科技与信息》2010,(1)

草坪作为园林绿化的基础造景,进行科学、细致的草坪养护管理工作必不可少,通过对马尼拉草坪的种植、浇水、施肥、修剪、除草除虫几方面加以论述,对小区域优质草坪的建植流程作了客观分析。  相似文献   

夏季高原牧草脂肪酸与牦牛乳脂脂肪酸特征及相关性研究     

杨静  梁琪  宋雪梅  张炎 《西北农业学报》2022,(4):506-516

通过测定青海省海北藏族自治州和甘肃省甘南藏族自治州的新鲜牦牛乳脂脂肪酸与当地牧草脂肪酸情况,探索和揭示牧草和牦牛乳脂脂肪酸组成特征及其相关性.采取两地区夏季牧场新鲜牧草和牦牛乳酥油,利用GC-MS进行脂肪酸分析.结果表明:海北牧草中共检测出28种脂肪酸,甘南牧草中检出33种脂肪酸,两地区牧草中PUFA含量差异大(72....  相似文献   

Effects of liming on yield,forage cation composition,and tetany potential of wheat in Kansas     

《Communications in Soil Science and Plant Analysis》2012,43(4):717-736

Abstract

We studied the effects of liming on dry matter production, nutrient composition, and grain yields of wheat in field experiments conducted on two soil types at three locations during the 1976–77 and 1977–78 growing seasons. Lime sources were commercial agricultural lime, finely divided stack dust, and dolomitic limestone (which contained 10.6% Mg). Lime applied at 2,800 kg/ha in the 1976–77 and 10,750 kg/ha in the 1977–78 experiments provided Mg from the dolomite at rates of 300 and 1,140 kg/ha, respectively.

Soil pH was significantly increased by liming, but Mg saturation percentages were significantly greater only at the 1,140 kg/ha rate. Forage dry matter and grain yields were not increased by lime applied at the lower rate, but significant increases were found in dry‐matter production in the late fall and spring samplings of the 1977–78 experiment. Those increases in plant growth and dry matter production were probably due to reductions in the soluble Mn and Al concentrations in the soil. Forage N and P concentrations were generally not influenced by liming. Potassium concentrations in forage from the limed plots were usually equal to or greater than those in forage from unlimed plots. Calcitic limestone sources generally increased forage Ca concentrations, but liming with dolomite more often than not depressed Ca concentrations below levels found in the check plots. Dolomite, when applied at the 1,140 kg/ha rate, effectively increased the forage Mg concentration, although the concentration exceeded 0.2% only during the early growth stages. Liming generally showed no significant reduction in the tetany potential of the wheat forage as predicted by the equivalent ratio K/(Ca + Mg).  相似文献   

淮北农区草业发展前景的探讨     

程为国  张绍孚 《安徽农业科学》1993,(1)

本文对淮北农区草业发展的历史和现状进行了分析,论述了淮北农区发展草业的必要性和可行性,提出了对策和措施。  相似文献   

奶牛脾虚慢草症的治疗体会          下载免费PDF全文

王斌  牛静勇  王福财 《中国牛业科学》2020,46(6):98-98

饮喂失调或劳伤过度,耗损气血,致使脾虚胃弱,引起水谷运化失常,不能输布精气,营养全身,久则畜体日渐瘦弱,食欲减少,即成脾虚慢草之症。中兽医经验方“扶脾散”由党参、黄芪、白术(土炒)、茯苓、泽泻、青皮、木香、厚朴、甘草、苍术(炒)组成,有补中益气、下气利水的功能,适用于脾虚慢草症,笔者在此方基础上加入当归、山药、扁豆、砂仁、枳壳、柴胡、升麻、陈皮、焦三仙等药物治疗奶牛脾虚慢草症效果显著。  相似文献