|古君1; 牛文全1,2; 吕望2; 李元1; 梁博惠2; 郭丽丽2
为探明番茄根系生长与水分分布之间的互反馈机制, 通过日光温室地下滴灌试验, 设置了4 种毛管埋
深(0 cm、10 cm、20 cm 和30 cm)和3 种灌水下限(保持土壤含水量为50%、60%和75%田间持水量), 研究了
下限为75%和60%田间持水量)时, 毛管埋深对番茄耗水量有显著影响, 10~20 cm 毛管埋深提高番茄耗水量。
毛管埋深增加会减少0~20 cm 土层根系分布, 促进20~60 cm 土层根系生长; 毛管埋深对0~10 cm、20~30 cm、
30~40 cm土层根系生长影响显著, 对50~60 cm 土层根系生长无显著影响。灌水下限对细根(d<1 mm)、粗根(d>1
mm)的根长与根表面积影响显著, 毛管埋深对细根的根长与根表面积有显著影响; 轻度水分亏缺及20 cm毛管
埋深有利于细根根长和根表面积生长, 减少粗根比例。本研究结果表明, 轻度水分亏缺及毛管埋深为20 cm 更
有利于全株干物质积累, 灌水下限为75%田间持水量能够增加根系干物质分配比例, 而20 cm 毛管埋深则能
Soil water is critical for crop growth, yield and water use efficiency. In order to study mutual responsive mechanism between
root growth and different irrigation methods (e.g., deficit and lateral irrigation) on soil water distribution, root distribution and dry matter
distribution in tomato, a test of subsurface drip irrigation was conducted in a sunlit greenhouse in Dazhai Villiage, Dazhai Town,
Yangling City, Shaanxi Province. The study was designed as a 2-factor experiment — lateral depth (D) and irrigation threshold (I). The
lateral depth was divided into 4 levels (0 cm, 10 cm, 20 cm and 30 cm) below the surface of ridges and the irrigation threshold set at 50%,
60% and 75% of field capacity. Each treatment was repeated 3 times. The results showed that lateral depth had a significant effect on
water consumption of tomato under mild water deficit (75% of field capacity) and moderate-mild water deficit (60% of field capacity)conditions, while lateral depth of 10–20 cm was much better for root water uptake than other treatments. Increase in lateral depth reduced
the distribution of roots in the 0–20 cm soil layer, but promoted the growth of roots in the 20–60 cm soil layer. Lateral depth had a
significant effect on root growth in the 0–10 cm, 20–30 cm and 30–40 cm soil layers, but had no significant effect on root growth in the
50–60 cm soil layer. Root length and root surface area of fine roots (with diameter less than 1 mm) and coarse roots (diameter greater
than 1 mm) of tomato were significantly affected by irrigation threshold. However, lateral depth only had a significantly effect on root
length and root surface area of fine roots. Then mild water deficit and lateral depth of 20 cm favored root length and surface area growth
of fine roots, but reduced the growth of coarse roots. Mild water deficit and lateral depth of 20 cm better favored total dry matter
accumulation, while the 75% of field capacity treatment increased root dry matter allocation. Then lateral depth of 20 cm promoted dry
matter accumulation of stems and leaves, but reduced the distribution ratio of root dry matter. For the observed responses, information on
how root distribution and dry matter allocation in tomato adapted to different irrigation methods provided a useful guide for field
production practices and possible indicator mechanisms for high quality/yield.
古君,牛文全,吕望,等. 灌水下限与毛管埋深对温室番茄生长的影响*[J]. 中国生态农业学报,2017,25(5):698-707.
古君,et al."灌水下限与毛管埋深对温室番茄生长的影响*".中国生态农业学报 25.5(2017):698-707.
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.