海藻酸钠-聚乙烯醇交联微球制备参数优化研究   总被引：2，自引：0，他引：2  

王莹  汪航  曾日中  黄茂芳  桂红星 《热带作物学报》2015,36(12):2254-2259

采用海藻酸钠和聚乙烯醇为包埋剂，选取交联时间、海藻酸钠和聚乙烯醇用量比（SA ∶ PVA）以及海藻酸钠和聚乙烯醇的总浓度为影响因素设计L49（52×7）正交实验，探讨包埋的最佳理化条件。以包埋材料的成球效果，包埋小球的硬度、弹性及微观结构为考察指标，比较包埋小球性能，探讨包埋条件。结果发现当SA ∶ PVA为7 ∶ 3，总浓度为4％，交联时间为24 h时包埋效果最佳。  相似文献   

Soil organic and inorganic carbon sequestration by consecutive biochar application: Results from a decade field experiment     

Siwei Shi  Qingzhong Zhang  Yilai Lou  Zhangliu Du  Qian Wang  Ning Hu  Yidong Wang  Anna Gunina  Jiqing Song 《Soil Use and Management》2021,37(1):95-103

Biochar addition can expand soil organic carbon (SOC) stock and has potential ability in mitigating climate change. Also, some incubation experiments have shown that biochar can increase soil inorganic carbon (SIC) contents. However, there is no direct evidence for this from the field experiment. In order to make up the sparseness of available data resulting from the long‐term effect of biochar amendment on soil carbon fractions, here we detected the contents and stocks of the bulk SIC and SOC fractions based on a 10‐year field experiment of consecutive biochar application in Shandong Province, China. There are three biochar treatments as no‐biochar (control), and biochar application at 4.5 Mg ha^?1 year^?1 (B4.5) and 9.0 Mg ha^?1 year^?1 (B9.0), respectively. The results showed that biochar application significantly enhanced SIC content (3.2%–24.3%), >53 μm particulate organic carbon content (POC, 38.2%–166.2%) and total soil organic carbon content (15.8%–82.2%), compared with the no‐biochar control. However, <53 μm silt–clay‐associated organic carbon (SCOC) content was significantly decreased (14%–27%) under the B9.0 treatment. Our study provides the direct field evidence that SIC contributed to carbon sequestration after the biochar application, and indicates that the applied biochar was allocated mainly in POC fraction. Further, the decreased SCOC and increased microbial biomass carbon contents observed in field suggest that the biochar application might exert a positive priming effect on native soil organic carbon.  相似文献   

基于正交设计的施用硫磺、控水灌溉和施肥对蓝莓生长的影响   总被引：1，自引：1，他引：0  

张悦  张会慧  周琳  魏殿文 《中国农学通报》2017,33(1):57-63

旨在优化高寒地区蓝莓栽培模式,利用正交试验研究了施用硫磺、控水和施肥3个因素对大兴安岭地区蓝莓品种‘美登’植株生长的影响。结果表明:3个因素正交处理对蓝莓生长指标的影响程度较大,不同处理之间各生长参数均存在较大的变异幅度,3个因素之间存在明显的互作效应,并且拮抗效应较小。极差分析结果表明,对蓝莓株高、冠幅和枝条长度影响最大的因素为土壤相对含水率,而对枝条粗度影响最大的因素为施肥。3个因素互作下均表现为各因素的3水平或4水平蓝莓生长性状最优,结合各生长参数的变化结果,建议大兴安岭地区蓝莓品种‘美登’施用硫磺量为70~80 g/m2,施硫酸钾复合肥7.5~10 g/株,土壤相对含水率维持在45%~60%。  相似文献   

“特丽”海棠在武汉地区的引种表现   总被引：1，自引：0，他引：1  

李长林  金莉  杨守坤  刘先葆 《北方园艺》2012,(5):87-88

2005年从郑州果树研究所引进"特丽",在武汉地区试栽观察,通过适应性观察和观赏性评价,"特丽"海棠在武汉地区栽培具有广阔的前景。  相似文献   

后备优质晚稻新品种引种试验   总被引：1，自引：0，他引：1  

吴南钦 《福建农业科技》2011,(4):1-2

进行8个优质稻新品种的引种试验,试验结果表明：8个品种均表现米质优,有7个品种生育期适宜、适应性较广,可作为宁德市蕉城区优质稻后备品种继续试种。  相似文献   

一堂兽医微生物学综合性实验课的教学实习     

闫敏鑫  张玉敏  黄明明  王婷  任慧英 《安徽农业科学》2013,(21):9026-9026,9041

介绍了硕士研究生在一堂完整的兽医微生物学综合性实验教学实习中，如何准备、组织及开展实验，并对教学实习中出现的问题及所获得的经验心得进行了总结。实践证明，研究生参加本科生实验课的教学实习是一项双赢的举措，具有重要意义。  相似文献   

An experimental study of charcoal degradation in a boreal forest     

《Soil biology & biochemistry》2013

Degradation rates of pyrogenic carbon (PyC) under natural environmental conditions are largely unknown. Here we present results from a field experiment monitoring the change in mass, C- and N concentrations of a variety of charcoal types in a Norwegian boreal forest over a period of 20 months. The charcoal types represent different feedstock tree species, production temperature regimes, and placements in the forest, i.e. above ground, in the humus layer or in contact with the mineral subsoil. The types of charcoal had different initial C concentrations mainly depending on their production temperature. Nevertheless, all types of charcoal at all placements in the forest showed an initial drop in their C concentrations, which subsequently rose back to reach near initial values in part of the charcoal types. In part of the charcoal types, N concentrations decreased throughout the experiment, exhibiting considerable variation among feedstock species, production temperature regime, and placements in the forest. C/N ratios rose especially in charcoal made from wood of Scots pine (Pinus sylvestris L.), and charcoal that had been stored in contact with the mineral subsoil showed the most rapid mass gain. Our results confirm the important influence of production temperature and feedstock type on the degradation of charcoal, but they also show that microbial activity and environmental conditions play significant roles in charcoal degradation and thus for the fate of pyrogenic carbon under natural conditions.  相似文献   

藏柏林营造试验初报     

王中兵  陈光海  张犀  刘自兵  祝开明  邓廷彬 《中国园艺文摘》2013,(11):216-217

1989年，在开县国有毛垭林场海拔1000 m处，进行藏柏采种林营造试验。经23年观测，藏柏在该处能正常生长发育。第4年有极少数单株挂果，种子无发芽力；第5年结的种子，发芽率为2％；第6年结的种子发芽率为33％。藏柏平均年生长高为88 cm，胸径为1.1 cm，超过当地乡土树种马尾松和杉木的生长量。  相似文献   

基于AHP-CRITIC法的正交设计优选贞芪颗粒提取工艺及促生长作用初步研究     

汪柱勇  杨新  周意  闵真立  张子健  陈亚军  李亚威  杨楚虹  刘洁  李硕 《中国兽药杂志》2021,55(10):54-63

（目的）开发一种具有促生长作用的新中兽药贞芪颗粒,优化其提取工艺并对其促生猪生长作用进行初步研究,为其工业化生产提供参考。（方法）以总多糖、黄芪甲苷、毛蕊异黄酮葡萄糖苷、特女贞苷、红景天苷、干膏得率作为评价指标,采用层次分析法（AHP）、基于指标相关性的权重确定方法（CRITIC）、AHP-CRITIC混合加权法确定各评价指标的权重系数,根据其正交试验结果优化贞芪颗粒提取工艺参数。将100头保育猪随机分为5组,通过在日粮中添加不同剂量的颗粒,连续喂养30天,与空白组和阳性对照组对比,计算平均日增重（ADG）、平均日采食量（ADFI）和料肉比（F: G）。（结果）AHP-CRITIC混合加权法科学优选出最佳提取工艺参数为复方药材加12-13倍质量的水提取3次（第一次13倍）,每次2.5 h。3批验证试验综合评分均值为98.91,RSD为0.79%。经过30天饲喂,高、中、低剂量组和阳性对照组的料重比无显著性差异（P>0.05）,但都显著低于空白对照组（P<0.05）,其中中剂量组的料重比最低。（结论）AHP-CRITIC混合加权法确定的权重系数客观、真实,优选出的贞芪颗粒提取工艺经验证,合理、稳定,重复性好,此工艺条件下制备的颗粒对生猪具有促进生长的作用。  相似文献   

凉茶渣的黑曲霉发酵工艺和抗氧化活性研究     

袁明贵  马广宇  徐志宏  彭新宇  田雅  魏琦麟  周廷斤  向蓉 《中国畜牧兽医》2021,48(4):1229-1239

为促进凉茶渣在畜牧业中的资源化利用,本研究以黑曲霉为菌种固态发酵凉茶渣,首先在单因素试验条件下考察了时间、温度、含水量、浸泡液pH、氮源和碳源对凉茶渣降解率和产物pH的影响;再根据单因素试验结果和规模化生产实际需要,以4%硫酸铵为氮源,2%葡萄糖为碳源,以降解率为考察指标,通过正交试验优化发酵工艺;并通过检测超氧自由基清除率、羟基自由基清除率和1,1-二苯基-2-三硝基苯肼（DPPH）自由基清除率,评价凉茶渣在最优工艺条件下发酵前后抗氧化活性的变化。结果发现,含水量为60%,浸泡液pH为9.0,31℃发酵168 h是凉茶渣的最佳发酵工艺参数。最佳工艺条件下凉茶渣的降解率为25.23%,发酵产物pH为4.53。当凉茶渣发酵前水提液浓度为24 mg/mL时,超氧自由基清除率为43.56%,羟基自由基清除率为47.06%,DPPH自由基清除率为90.71%;当最优条件下发酵产物水提液浓度24 mg/mL时,超氧自由基清除率为30.77%,羟基自由基清除率为95.63%,DPPH自由基清除率为87.36%。本试验结果表明,黑曲霉是适宜的凉茶渣发酵菌种,且凉茶渣经过黑曲霉发酵后具有良好的抗氧化活性。  相似文献