小麦高产经济施肥技术指标和参数

通过1986～1990年间80多个田间小麦肥效试验,研究了石家庄地区小麦生产进入高产阶段后不同肥力土壤上小麦肥效曲线方程、高产经济施肥指标。结果表明,不同肥力麦田的小麦高产经济施肥指标为:高肥力麦田亩施N11.1～13.8kg,P_2O_510.7～13.9kg,中肥力麦田亩施N12.6～15.2kg,P_2O_59.8～12.1kg;低肥力麦田亩施N13.3～15.5kg,P_2O_59.1～11.7kg。还研究了小麦目标产量施肥法所需的三个施肥参数:(1)小麦百公斤产量养分吸收量,空白区平均为:N2.32kg,P_2O_51.05kg,K_2O2.72kg;施肥区平均为:N2.82kg,P_2_51.03kg,K_2O_3.15kg。(2)土壤速效磷和碱解氮的校正系数(C_P、C_N)分别为:C_P=0.41+4.01/P,C_N=0.28+0.035P。(3)氮、磷肥利用率(Z_N、Z_P)分别为:Z_N(％)=42.1-0.35P,Z_P(％)=27.6-1.20P(P为土壤速效磷含量)。     

Parallel Algorithm of Structural Optimization Based on Space time Transform

In this paper an attempt has been practised to introduce parallel techniques into the structural optimization.Based on space time transform five approaches for parallel computation of structural optimization have been presented.This paper has also pointed out the problems originated from large scale systems of structural optimization (LSSO) and put forward the technical line of design of LSSO.     

水稻冠层垂直反射率模拟

利用1999年和2000年实测的晚稻冠层结构参数(叶面积指数、叶倾角、叶长、叶宽等)和叶片生物化学组分含量(叶绿素、蛋白质、纤维素、水等)实测数据,结合椭圆分布函数模型、PROSPECT模型和FCR模型,模拟水稻冠层垂直反射率,模拟值与实测值的相关系数大于0.98,均方根差RMSE小于0.05,从而建立了冠层结构参数、叶片生物化学组成等农     

生物电化学系统还原二氧化碳产甲烷研究进展

生物电化学系统还原CO2合成燃料或有机化工产品近年来已成为环境微生物学的研究热点。首先就生物电化学系统的工作原理、生物电化学系统还原CO2产甲烷的阴极功能微生物、生物电化学系统还原CO2产甲烷的机制、生物电化学系统的反应器及影响生物电化学系统还原CO2产甲烷的因素等方面的研究进展进行了综述,然后分析了生物电化学系统还原CO2产甲烷存在的问题,并讨论了其今后的重点研究方向,以期为生物电化学系统还原CO2产甲烷研究提供参考。     

快速工业化中耕地变化与保护 ——以江苏如东县为例

快速工业化中，城镇化和工业化导致建设用地大量增加、耕地锐减，从而造成经济发展与用地的不协调。尝试通过对江苏省如东县近10年工业化发展与耕地变化的分析相关，厘清影响耕地变化的主导因素，从而有针对地提出耕地保护的有效对策。笔者主要应用定性与定量相结合的方法进行工业化与耕地变化相关性分析；应用霍夫曼系数来确定工业化阶段，应用单因素逐一回归分析耕地变化情况。研究结果表明，近10年如东县工业化处于加速发展阶段，耕地变化显著；导致耕地变化的主导因素主要是城市化和固定投资；应该通过集约节约用地、深挖用地潜力、协调城乡用地等方面进行耕地保护。     

WEIGHTING FUNCTION IN NONLOCAL STRAIN SOFTENING DAMAGE MODEL

In the paper,the weighting function is investigated which plays an importantpart in nonlocal strain softening damage model.Its expression is derived and behaviours including therelationship between the weighting function and the characteristic length of heterogeneous materialsare analyzed.The method for calculating monlocal quantities is also presented.Selecting of theweighting function has important significance for more objectively establishing nonlocal damagemodel and analysis of damage of heterogeneous materials by numerical methods.     

离子束生物技术在棉花育种中的应用述评

近年来，离子束生物技术在农作物育种研究中取得了很大进展。本文主要总结了离子注入诱变技术和离子束介导转基因技术在棉花育种中的应用现状，对存在的问题进行了分析，论述了离子束生物技术在棉花育种中的应用前景。     

Fine mapping of the genetic locus L1 conferring black pods using a chromosome segment substitution line population of soybean

The colour of plant organs is a useful trait in crop breeding. The pod colours of soybeans primarily include black, brown and tan types, which are controlled by two classical genetic loci, L1 and L2. Most wild soybeans have black pods, which reflect a possible role in adaptation to the natural environment. Here, an improved chromosome segment substitution line (CSSL) population SojaCSSLP3 was established to identify the L1 gene. The segment on the 19th chromosome represented by the SSR marker Satt313 was found to link with locus L1. The region was further delimited three times with increased SSR and InDel markers using a population derived from a heterozygous plant of CSSL124 from SojaCSSLP3. The L1 gene was finally located in a 184.43‐kb region between SSR_19p09 and Indel_19P7. Thirteen putative genes in this region were analysed with qRT‐PCR. The expression level of Glyma19 g27460, which is a member of the SANT superfamily with a MYB DNA‐binding domain, was significantly upregulated in black pods and was recognized to be the most likely candidate for the L1 gene.     

Research on Indoor CO2 Density in Chongqing Commercial Buildings

The density of indoor CO 2 is an important value for newly_built commercial buildings. It affects comercial buildings in two aspects, one is the indoor air_quality, the other is the consumption of energy. The aim of design is to keep good indoor air_quality and using little ventilation. The authors measure a typical department store and analyze the measurement. The conclusion as well as the opinion is given, which argues for improving the efficiency of new_wind.