毛果苔草种群地上生物量与株长或鞘高分形特征

By using the principles and methods of fractal geometry theory, the relationship between aboveground biomass and plant length or sheath height of Carex lasiocarpa population was studied. The results showed that there was a good static fractal relationship between them, and the resulted fractal dimension was an efficient description of the accumulation of aboveground biomass in each organ. The dynamic fractal relationship showed that during the whole growing season, the increase of aboveground biomass had a self-similarity, being a fractal growth process, and the pattern of its increase was the fractal dimension D. Based on these results, a fractal growth model of Carex lasiocarpa population was established, which regarded the bigger grass as the result of the amplification of seedling growth.

Research on Relationship between Recovery Ability after Drought Stress-rewatering and Water Use Efficiency of Winter Wheat Varieties

The study aims at exploring the possibility of using the recovery ability af- ter drought stress-rewatering at vegetative growth stage as the evaluating index in water use efficiency （WUE） of winter wheat varieties. ＇Jing 411 ＇, ＇Jinmai 47＇ and their 34 near isogenic lines （NILs） were used as test materials. Semi-automatic rainproof shelter and the percolating pools were used for simulating drought treat- ment. After suffering severe drought stress, winter wheat crops were rewatered at early jointing stage. The biomass accumulation after rewatering was determined as recovery ability index. In the meanwhile, plant height in the end of vegetative growth stage was measured, and WUE of varieties/lines was also determined. Thereafter, the differences in recovery ability, plant height and the population WUE, together with the correlation between recovery ability and population WUE were analyzed, respectively. The results showed that there were significant differences in recovery ability among some varieties/lines. The recovery ability was affected by both geno- type and environment, and the interaction existed in these two factors. Significant differences existed in plant height and population WUE among the 34 NILs along with their parents. There was a significantly positive correlation between recovery ability and plant height of varieties/lines. Recovery ability and plant height were very significantly and positively correlated with population yield WUE respectively. The re- sults indicated that recovery ability after drought stress-rewatering could be used as an evaluating index of population WUE under drought condition.

植物生长延缓剂对草坪草生长发育的影响

[目的]为了研究美国研制生产的植物生长延缓剂Proxy对草坪草生长发育的影响。[方法]以冷季型草坪草高羊茅和草地早熟禾为试验材料,盆栽试验设低浓度Proxy、中浓度Proxy、高浓度Proxy和清水(CK)4个处理,研究不同浓度Proxy在我国北方气候条件下对草坪草株高、草屑量和生长格局的影响。[结果]中、高浓度Proxy处理显著降低了草地早熟禾的株高和草屑量,而对高羊茅株高和草屑量影响不显著。中、高浓度Proxy处理使草地早熟禾的生长格局发生了明显变化,如抑制垂直生长、加速横向生长、叶片变短增厚等,草坪质量明显改善,而低浓度处理效果不明显。Proxy各浓度处理对高羊茅生长格局影响不明显。[结论]该研究为我国北方草坪草生长的合理调控提供了理论依据。

吉林玉米带春季土壤水分变化对玉米幼苗生长状况的影响

2010年和2011年春季,在吉林省中部玉米主产区开展玉米分期播种和土壤水分胁迫田间试验,每年均设3个播期和4个水分处理,观测播种-7叶期间的土壤水分、灌水量、降水量、气温,以及7叶期后的玉米发育期株高、叶龄和生物量,采用回归分析方法分析土壤水分变化对玉米长势的影响.结果表明,春季土壤持续缺水抑制玉米幼苗茎叶生长,减缓生物量积累.玉米相对叶龄、相对株高和相对于重（均为与对照相比）与播种-7叶期平均土壤湿度间均为显著的二次函数关系,土壤湿度每降低1个百分点,玉米苗期相对叶龄、相对株高和相对干重分别降低5.5、5.6和11.0个百分点.0-20cm土层平均土壤湿度在21.5％～24.0％（或同期土壤有效水量在70 ～85mm）时最适合玉米幼苗生长;土壤湿度降至18％,则玉米苗相对叶龄、相对株高和相对于重分别从适宜土壤湿度条件下的100％降至80％、85％和70％左右;当土壤湿度处于16％以下时,相对叶龄、相对株高和相对干重分别降至68％、70％和50％以下.研究结果对玉米苗情评价、春旱影响评估及灌溉均具有指导意义.

胡麻F_3群体不同株高单株生产力研究

通过对5个胡麻F3杂种不同株高的单株生产力进行复因素随机区组统计分析,进而对其产量构成因素和株高间的关系进行了相关分析,结果表明矮杆植株单株生产力显著高于高杆植株和中杆植株;株高与每果粒数成显著负相关,与单株果数及千粒重大多相关不显著,在杂种后代的选择中,选择矮杆、开花早、开花集中、分枝集中等性状的单株对育成高产品种具有重要作用。

章丘大葱夏季栽培研究

以章丘大葱大梧桐品种为试材,研究了夏季栽培中铺麦草、干湿栽和遮光对大葱株高﹑单株重等生长指标的影响。结果表明,章丘大葱在7-9月的夏季栽培中,铺麦草不利于大葱长高及产量增加,而合理的干湿栽及遮光处理可促进大葱长高和增重。利用遮光率30%的遮阳网遮荫30天、不铺麦草、干栽的栽培模式,可促进大葱生长,显著提高大葱单株重,具有较大增产潜力。