The effect of drought on the leaf area of ​​plants

The effect of drought on the leaf area of ​​plants

Under drought stress, the plant experiences a series of corresponding morphological and physiological biochemical changes. Among them, the effect of drought stress on plant growth is the most intuitive. Studies have shown that mild water deficits are sufficient to significantly reduce plant leaf growth. For example, Zhang Ying et al. conducted a study on the effects of different levels of drought stress on plant height of maize and found that when the leaf water potential dropped to -0.62 MPa, the plant height was only 81% of the control, and when the water potential dropped to -1.00 MPa, the plant height was only controlled. 59%. Drought stress significantly reduced the leaf area, lateral root number, and root length of Korean pine, Ash, Eucalyptus, and Quercus mongolica. The measurement of soil water potential can be performed by means of a digital tension meter.

The following experiments were conducted on the growth of Pinus massoniana seedlings and comparisons were made. : To study the effects of different degrees of cyclical drought stress on the growth and biomass of five provenances of Pinus massoniana seedlings in Guangdong Lechang, Yuanan in Hubei, Xiangcheng in Hunan, Jiangshan in Zhejiang, and Huoshan in Anhui. The results showed that: (1) Under drought stress, the seedlings of various species of Pinus massoniana decreased with the decrease of soil water potential, and the damage to the external morphology was aggravated, but there was no significant difference in the external morphology between the various sources at the same stress level. (2) Under high drought stress, the height growth of P. massoniana seedlings was inhibited. Among them, the drought stress had the smallest impact on the high growth of seedlings. The seedling height was 1.86 cm and the growth rate was 15.79% under heavy drought stress; followed by Hubei Yuanan, Huoshan of Anhui, and Wucheng of Hunan. Drought stress has the greatest impact on the high growth rate of seedlings in Guangdong Lechang provenance. Under severe stress, the seedling height increase is only 0.35cm, and the seedling height growth rate is only 2.33%. (3) The responses of various biomasses of Pinus massoniana to drought stress were basically the same. With the increase of the degree of water stress, the accumulation of biomass was inhibited. Among the five provenances, the provenances of Hubei Yuanan and Lechang of Guangdong were relatively less affected; followed by provenances of Huoshan of Anhui Province, Lucheng of Hunan Province, and Jiangshan of Zhejiang Province.

From the above it can be seen that the effect of drought on the plant, so by using a digital tension meter to measure and perform appropriate regulation to reduce the loss caused by drought.