和田地区湿地生态系统服务功能价值评估研究

以和田地区湿地为研究对象,建立和田地区湿地生态系统服务功能评估指标体系,采用市场价值法、影子工程法、碳税法,工业制氧法和替代法等对和田地区湿地的资源供给、调节服务、支持服务及科研文化服务4大类功能11项评估指标进行评估。结果表明:和田地区湿地生态系统服务功能总价值为1 787 153.92×10~4元·a~(-1),其中价值量最大的为调节服务功能,价值843 317.18×10~4元·a~(-1),占总价值的47.19%;最小的为资源供给服务,价值119 122.13×10~4元·a~(-1),占6.67%;支持服务功能和科研文化服务功能价值分别为691 376.11×10~4元·a~(-1)和133 338.50×10~4元·a~(-1),分别占38.69%和7.46%。所评估的11项指标中,涵养水源与调蓄洪水功能价值最大,为448 224.43×10~4元·a~(-1),占总价值的25.08%;降解污染功能价值最小,为970.99×10~4元·a~(-1),占0.06%。     

长季节岩棉栽培中番茄的叶片生长特性

本文就长季节岩棉栽培中番茄叶片的生长特性进行了细致的观察及深入的研究, 认为番茄第一果穗下的基生叶, 光合养分主要用于自身建设, 随叶位提高叶片面积增大, 二者呈显著正相关（Ｒ２ ＝ ０－９９） 。两果穗之间的三片叶中以果穗上的第一叶叶面积较小, 这主要表现在叶宽的差异上, 而叶长相差不大, 这是由于养分竞争影响了叶宽的扩展而造成的。果穗之间充分成熟的叶片, 叶形比小于１ , 即叶长小于叶宽。而未充分成熟的叶片, 叶面积随叶位上升而减小, 并且叶形指数在增大, 表明叶长生长先于叶宽。在植株的整个生长期间, 最大的叶片通常出现在１ ～５ 穗果之间（ 第１０ ～２５ 片叶之间） , 这与前期座果少、冠层未封闭、见光好有关。叶片的这些生长特性受营养液组成（ＥＣ＝ １０ｄｓ／ｍ） 及蒸腾势处理的影响较小     

影响绒山羊冻精质量de几个冷冻技术环节

影响绒山羊冻精质量的技术环节,主要由冷冻温度、降温速度以及冷冻容器的选择等构成。1 冷冻温度冷冻温度影响精液冷冻后的存活率、顶体完整率、受精率等生物参数。冷冻后精子存活率的高低通过低温温度计测定精液在冷冻容器中冷冻的变化来反映精液速冻温度的变化曲线。尤其冻制细管精液时如果不考虑冷冻容器和冷冻环境的温度及每批精液冷冻总容量,而是盲目地根据精液和冷源的距离决定冷冻温度是不准确的,这样导致精子活率低而达不到国标要求。冷冻精液是一项动物繁育技术,如果不用科学仪器在生产中进行监测,不遵循先进的冷冻程序是很难保证…     

如何走出治疗和护理犊牛腹泻的误区

犊牛腹泻病虽属常见病，但由于病因复杂多变，在治疗和护理方面存在不少误区．给养殖户造成不小的经济损失。那么，生产中如何走出犊牛腹泻病治疗和护理的误区呢？本文就此作一探讨，供大家参考。     

江永花卉迷人眼

在柳绿桃红的4月，笔者慕名来到江永县职业中学花木种子团。扑面而来的便是一阵阵沁人心脾的浓郁花香。这个占地不足0.33公顷的花圃，整齐有序地摆放着300多盆造型各异的艺术盆景及800多盆千姿百态的各类花卉；瓜叶菊淡雅素丽．仪态万千；一品红雍容华贵，鲜艳可爱；仙客来娜娜多姿，色泽艳丽；更有萌孝吐芳、素雅清香的水仙花，还有树姿优美、色彩缤纷的山茶花，猩红的热情奔放，粉红的端庄淡雅，洒上的妩媚姣格。为迎合今春花卉消费市场的旺盛需求，该国进一步扩大生产规模，3月底又投资2万元，购进了大量花盆。据统计，全县已有类似该园…     

Failed attempt of Cryptosporidium andersoni infection in lambs

Four lambs 4 months old were inoculated with Cryptosporidium andersoni oocysts (bovine isolate) in a dose of 5 x 10(6) per animal followed later by 1 x 10(7) oocysts per animal. No animal shed Cryptosporidium oocysts during 56 days post infection, no lamb showed clinical symptoms of cryptosporidiosis and no macroscopic changes were detected in the abomasum immediately after autopsy. Histological examinations did not demonstrate the occurrence of Cryptosporidium in the abomasum and other selected organs.     

Study of immune response in pigs fed with high vitamin E-dosages

The effects of long-term vitamin E-supplementation on phagocytic cells, lymphocyte sub-populations, and SWC3+ cell count were studied in pigs. Eighteen weaned pigs were divided into three groups: 1) 100 mg DL-alpha tocopheryl acetate/kg diet, 2) 200 mg DL-alpha tocopheryl acetate/kg diet, 3) control group (basic feed with 10 mg DL-alpha tocopheryl acetate/kg diet). The examination of the immune indices was performed on day 120 of feeding the supplemented diets. The higher dietary levels of vitamin E resulted in increased serum concentration of alpha-tocopherol for both experimental groups (p < 0.05) and there were no significant differences in counts of CD2+, CD4+, CD8+, B lymphocytes nor SWC3+ cells among the groups. Similarly, vitamin E supplementation did not affect the functions of phagocytic cells tested.     

The urinary excretion of selenium in sheep treated with a vasopressin analogue

The renal excretion of selenium was investigated in ewes with an excretion of hypotonic urine (control group) and in ewes with a formation of highly concentrated urine. Chronic stimulation of the urinary concentrating activity of sheep kidneys was induced by a long-term treatment with 1-desamino-8-D-arginine vasopressin (dDAVP), a synthetic analogue of vasopressin with prolonged effects. Young animals with 22 to 25 kg b.w. were fed a normal protein diet providing a daily intake of 129.25 g of crude protein, 12.03 MJ of digestible energy and 0.18 mg of selenium for 3 weeks. The vasopressin treated sheep (n = 11) were given subcutaneous injections of 12.5 micrograms of dDAVP in glycerol twice daily for one week before the clearance measurement of renal functions. The control group (n = 11) was treated with glycerol only. The administration of dDAVP resulted in a highly significant decrease of the urinary flow rate (from 3.19 +/- 0.50 in control group to 0.33 +/- 0.03 mL.min-1 in dDAVP animals, P < 0.001) without changes in the glomerular filtration rate (80.18 +/- 6.36 in controls vs. 77.86 +/- 6.26 mL.min-1, NS). No effects on plasma selenium level were observed (0.17 +/- 0.03 in controls vs. 0.20 +/- 0.03 mumol.L-1, NS) but the amounts of selenium excreted were found to be highly significantly reduced (from 0.29 +/- 0.05 in controls to 0.03 +/- 0.01 nmol.min-1, P < 0.001) in dDAVP treated sheep. Despite a large reduction in urinary flow rate, the selenium concentration in urine was actually the same in both groups (0.09 +/- 0.01 mumol.L-1) resulting in a sharp fall in the renal clearance of selenium (2.20 +/- 0.54 in controls vs. 0.18 +/- 0.03 mL.min-1, P < 0.01) due to dDAVP. This seems to be a consequence of the large increase in the selenium solvent drag induced by a vasopressin treatment. The results presented suggest that vasopressin may contribute to maintenance of the selenium balance in sheep via its effects on renal function.     

使用自配饲料存在的问题与改进措施

目前，由于商品饲料价格较高，运输费用较大，质量较差等原因，致使大多数养殖场户购买原料，使用自配饲料，其目的是为了降低成本，提高效益．但往往因为缺乏相应的专业知识和检测、加工设备，而在生产中造成损失．1使用饲料存在的问题1．1稀喂熟唱仍占较大的比重据调查，目前养殖场户采用稀喂熟喂法饲养畜禽的约占30％以上，特别是养猪户，他们认为稀喂猪吃得多、长得快；熟喂食敛浆，稠度大，猪爱吃．殊不知稀汤灌大肚无法满足猪的营养需要，熟喂不仅费业费时费燃料，而且饲料中的许多维生素等营养物质因加热而被破坏1．2不分饲料种类和…