On the other , the decrease of spad and the soluble sugar content and the activity of nr of the hyperaccumulators appeared significant difference 但各种供试富集植物的aba含量一直呈上升趋势，且差异显著。
2.
The concentration of lead treatment was 400mg . l " " , and the screened standards are spad of plant leaves , the plant length and the content of lead in plants 同时满足条件处理叶绿素值对照叶绿值0 . 90 、处理株高对照株高1 . 00和处理含pb量500mg kg的植物做进一步的耐性试验。
3.
Meet jointly to the criteria of spad / ck > 0 . 9 , plant length / ck > 1 . 00 and lead content > 500mg / kg , and they are claimed hyperaccumulators . 2 . ecophysiological response of the hyperaccumulators 按以上标准筛选出6个富集pb的植物品种，分别是香根草、绿叶苋菜、裂叶荆芥、羽叶鬼针草、紫穗槐和苍耳。
4.
All parameters exhibited spatial correlation except for soil ph . soil total n and organic matter , spad , lai and spad lai were all positively correlated to rice yield 发现除土壤ph值外的其它土壤特性、作物长势和产量都表现出空间自相关性，达到中等及以上强度；土壤全氮、有机质、 spad 、 lai 、 spad * lai与产量均达到极显著正相关。
5.
On one hand , the growth of spad and the activity of nr had no significant difference at 5 % level . the maximum of soluble sugar content of amaranthus tricolor and bidens maximowiciziana showed significant difference compared with the contrched samples 试验结果表明，随着pb处理浓度的增加，各种富集植物的叶片叶绿素值、可溶性糖含量和硝酸还原酶活性表现出相同趋势，上升后又下降。
6.
1 , 2 . 3 , 4 , 5 , 6 respectively . with the increase of lead level , the changing trend of spad and soluble sugar content and the activity of nitric acid reverting enzyme ( nr ) had appeared the same direction , which ascended first and then fell 2植物对pb污染的生理生态效应为了揭示pb污染对富集pb植物的生理代谢活动的影响，测定了叶片叶绿素含量、可溶性糖含量、硝酸还原酶的活性和脱落酸含量等生理指标。
7.
Effect of nutrient elements on lead uptake of hyperaccumulators . a little amount nitrogen and potassium can accelerate the growth of spad and plant dry weights , advance the lead uptake of hyperaccumulators . but with the increasing of nitrogon and potassium concentration , the lead uptake of plants droped , and spad and dry weights rose constantly 5营养元素n 、 p 、 k对植物吸收pb的影响少量的n和k会促进富集植物叶片叶绿素值和干重的增加，促进植物对pb的吸收，随着n和k水平的增加，植物对pb的吸收能力降低，但k的抑制作用不如n的显著，叶绿素值和干重一直在增加；土壤供p会降低植物对pb的吸收，且下降极显著。
8.
Kriged interpolation maps provided good indication of the spatial variability in crop yield and growth status . spatial interpolation and correlation analysis proved that spad lai was more indicative of crop growth status than individual variable , and useful for implementing growth season regulation and topdressing as needed 克里格插值图可很好地描述作物长势和产量的空间变异，空间插值分析与相关分析结果都说明，采用spad * lai二乘因子较之单个变量能更精确反映作物长势，从而有助于实施产中调控和按需补给。
9.
This research investigated the variability and the quantitative relationships among soil nutrients ( soil ph , total n , organic matter , available p ) , growth status ( spad , lai and spad lai ) and yield of rice . all data were analyzed by both classical statistics and geostatistics based on gis . by further integrating gis , gps and crop management knowledge model , a decision support system for precision farming ( dsspf ) was developed , which laid a technical foundation for the practical application of precision farming system 本研究基于gis技术，以经典统计和地统计学为分析手段，确立了田区土壤养分(土壤ph 、全氮、有机质、速效磷、速效钾) 、水稻作物长势( spad 、 lai 、 spad * lai )和产量的空间变异特征及定量关系；进一步以作物管理知识模型为智能决策支撑，提出了gis与模型及gis与gps的组件化集成技术，构建和实现了基于田区作物产量、土壤养分和苗情监测差异的精确农作决策支持系统( dsspf ) ，为精确农作系统的应用奠定了技术基础。
