Analysis and Producing Causes of Available Sulphur Status quo(Rich or Insufficient) in Farmlands and Countermeasures in Dengzhou City

In the research, available sulphur in 4 700 soil samples was tested and analyzed in 2006-2007 in Dengzhou, and the results showed that available sulphur was insufficient in farmlands in Dengzhou for cereal crop and about 60% farmlands with available sulphur belong to the farmlands with potential shortage of available sulphur for Cruciferae, Liliaceae and Leguminosae. Meanwhile, the producing causes were analyzed from the perspectives of fertilization structure and planting structure and the countermeasures were proposed in terms of sulphur movements in plants and characters.

Soil ^(35)S Transformation and Availability to Plants

Sulfur transformation in 3 soils maintained in a closed incubation system and its availability to plants were investigated using carrier-free35S-SO42- and 35S-labeled ryegrass straw. For carrier-free Na235SO4 treatment, 78%, 70% and 64% of 35S applied were found in Ca (H2PO4)2-extractble S fraction 14%, 5% and 7% in slowly soluble inorganic S, 11%, 15% and 18% in C-O-S, 5%, 7% and 6% in C-bonded S, and 5%,7% and 6% in unidentified organic S 120 days after incubation in black soil, cinnamon soil and chestnut soil, respectively. Most of 35S uptake by plants came from extractable 35S42-, and little from C-O-35S and C-bonded 355. In the treatment with 35S-labeled straw, 51%, 46% and 36% of 355 incorporated were found in C a (H2PO4)2 -extractable S fraction) 7%, 6% and 7% in slowly solub ie inorganic S, 13%, 15% and 18% in C-O-S, 8%, 8% and 6% in C-bonded S, and 18%, 25% and 35% in unidentified organic S at the end of incubation in above-mentioned three soils, respectively. Higher availability of C-O-35S, C-bonded 35S and unidentified organic 35S from 35S-labeled straw was observed in 35S-labeled straw treatment compared to carrier-free Na235SO4 treatment.

Influence of Different Lubricants on Deformation Behaviour of IN 718 Alloy in Hot Compression Process

The influence of different lubricants on the deformation behaviour of IN 718 alloy was studied. The results show that, with the improvement of lubrication condition, the deformation of the alloy tends to be homogeneous, and the resistance of deformation decreases. Consequently, FR 2 glass lubricant is considered to be an ideal choice when the relationship between stress and strain of IN 718 alloy is measured by means of hot compression experiment.

石灰性土壤中硫形态组分及其影响因素

对陕西 ,湖南等 7省 (市 ) 2 2个农田耕层土壤硫形态组分的分析表明 ,供试土壤总硫平均为4 0 5 .5± 111.8mg/kg ,总有机硫占总硫 85 .4 %± 10 .0 %。供试土壤中酯键硫 (C -O -S)、碳键硫(C -S)、惰性硫平均含量分别为 130 .3± 6 4 .6、6 5 .5± 2 9.4、15 2 .5± 96 .7mg/kg ,分别占总硫的31.4 %± 12 .9%、18.0 %± 10 .7%、36 .0 %± 17.8% ;分别占总有机硫的 36 .6 %± 14.4 %、2 1.8± 13.8%、4 1.5 %± 19.1%。石灰性土壤C -O -S、C -S形态硫与土壤有机碳之间分别呈极显著 (r =0 .7334 )和显著 (r =0 .4 4 2 6 )正相关。石灰性母质发育土壤C -O -S含量显著大于黄土母质发育的土壤。供试土壤无机硫组分中主要是难溶硫 ,其平均含量达 2 8.4mg/kg ,占总无机硫 5 0 .7%。土壤中难溶硫与总无机硫 (r =0 .6 0 4 0 )和CaCO3 (r =0 .6 80 0 )之间呈极显著正相关 ,而与总有机硫 (r =- 0 .5 2 86 )、C -O -S (r =- 0 .4 4 17 )和有机碳 (r =- 0 4 786 )之间呈显著负相关。黄土母质发育土壤难溶硫含量 ,占总硫和占总无机硫的比例显著或极显著高于石灰性母质发育的土壤。为了全面评价石灰性土壤硫素供应潜力 ,有必要开展石灰性土壤难溶硫形成及转化规律和生物有效性的研究。

陕西农田土壤硫分布特征及其与土壤性质的关系

采集陕西省6个主要气候类型区农田的耕层土壤样品305个,测定其全硫和有效硫含量.结果表明,陕西省土壤全硫含量变幅为33～769 mg/kg,平均值为360 mg/kg,有效硫含量4.6～157.3 mg/kg之间,平均值29.3 mg/kg.全省不同气候类型区全硫含量顺序为:渭北旱塬区>陕北丘陵区>关中灌区>陕北风沙滩地>陕南川道区 >秦巴浅山丘陵区,有效硫含量顺序为:陕南川道区>陕北风沙滩地>秦巴浅山丘陵区>渭北旱塬区>关中灌区>陕北丘陵区.土壤全硫和有效硫之间、全硫与有机质之间、有效硫与有机质之间有显著正相关关系,全硫与土壤pH之间有负相关关系.

稻作制与有机肥及地下水位对水稻土硫素状况的影响 Ⅰ.全硫和有效硫含量

为探明耕作、施肥、灌溉等农艺措施对水稻土硫素状况的影响 ,研究了在长期定位试验条件下稻作制、有机肥用量及地下水位对水稻土全硫及有效硫含量的影响 .结果表明 ,不同稻作制间 ,耕层土壤全硫含量以稻 -稻 -冬泡最高 ,稻 -稻 -冬绿次之 ,稻 -稻 -冬油最低 ;有效硫含量则以冬绿处理最高 ,冬泡处理最低 ;不同有机肥施用水平之间 ,耕层土壤全硫含量为常量有机肥处理最高 ,高量有机肥处理居中 ,化肥处理最低 .高地下水位能提高土壤中全硫含量 。

黑龙江省主要土壤硫的形态及其有效性的研究（Ⅰ）

在测定黑龙江省几种主要土壤耕层（０～２０ｃｍ）中全硫和有效硫含量的基础上，进一步采用化学连续浸提法测定了土壤４种形态硫，即水溶性硫、吸附性硫、盐酸可溶性硫和有机硫。并通过各种形态硫含量间相关分析和生物试验，说明土壤４种形态硫中，以水溶性硫的有效性最高，它同有效硫的相关系数达到极显著水平，ｒ＝０．９９６７。同生物试验小麦，洋葱植株含硫量间相关数分别达到极显著和显著水平，ｒ＝０．９８９４和０．９０５４。吸附性硫的有效性居中，它同有效硫的相关系数达到显著水平，ｒ＝０．５０１２。盐酸可溶性硫和有机硫的有效性较低，盐酸可溶性流与有效硫和全硫无明显相关。有机硫与全硫的相关系数达到极显著水平，ｒ＝０．９６５３。

伏牛山高硫铜锌矿选矿工艺研究

对伏牛山高硫铜锌矿石进行工艺矿物学和选矿工艺研究,研究表明,采用优先选铜—锌硫混合浮选再分离及铜锌硫依次优先浮选工艺可较好地回收矿石中的铜锌硫,优先选铜—锌硫混合浮选再分离流程得到含铜27.17%、铜回收率86.27%的铜精矿,含锌50.53%、锌回收率88.11%的锌精矿,含硫42.34%、硫回收率78.23%的硫精矿。选矿厂按此流程改造后,可产出含锌42.19%、锌回收率59.30%的锌精矿。

TLC法定性比较冬虫夏草与固体发酵虫草

目的:比较冬虫夏草与固体发酵虫草在化学成分上的相似性。方法:采用薄层色谱法,从总体成分和不同提取部位比较冬虫夏草和固体发酵虫草。结果:固体发酵虫草斑点位置同冬虫夏草基本一致,只是大小有所差别。结论:固体发酵虫草与冬虫夏草有相似的化学成分,有待进一步研究。