Parallel Compiler

Zeng

et al. 2019

Forests

In the context of uneven-aged mixed-species forest management, an individual-tree basal area increment model considering forest structural diversity was developed for oaks (Quercus spp.) using data collected from 11,860 observations in 845 sample plots from the 7th (2004), 8th (2009), and 9th (2014) Chinese National Forest Inventory in Hunan Province, south-central China. Since the data was longitudinal and had a nested structure, we used a linear mixed-effects approach to construct the model. We also used the variance function and an autocorrelation structure to describe within-plot heteroscedasticity and autocorrelation. Finally, the optimal mixed-effects model was determined based on the Akaike information criterion (AIC), Bayesian information criterion (BIC), log-likelihood (Loglik) and the likelihood ratio test (LRT). The results indicate that the reciprocal transformation of initial diameter at breast height (1/DBH), relative density index (RD), number of trees per hectare (NT), elevation (EL) and Gini coefficient (GC) had a significant impact on the individual-tree basal area increment. In comparison to the basic model developed using least absolute shrinkage and selection operator (LASSO) regression, the mixed-effects model performance was greatly improved. In addition, we observed that the heteroscedasticity was successfully removed by the exponent function and autocorrelation was significantly corrected by AR(1). Our final model also indicated that forest structural diversity significantly affected tree growth and hence should not be neglected. We hope that our final model will contribute to the scientific management of oak-dominated forests.

Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 84%

See 1 more Smart Citation

Development of a Mixed-Effects Individual-Tree Basal Area Increment Model for Oaks (Quercus spp.) Considering Forest Structural Diversity

Zeng

et al. 2019

Forests

“…The RHM, the NRHM, and the EM are the most widely used. These models are usually evaluated qualitatively (Duan & Zhang, 2009;Lang et al, 2013), which restricts their accuracy in determining how well the data fit the models. In the practical application, it is found that the maximum net photosynthetic rate is much higher than the measured value when fitting the photo response data with these models (Steel, 1962;Evans, Jakonbsen & Ogren, 1993;Ye, 2007;Posada, Lechowicz & Kitajima, 2009), and the light saturation point is much smaller than the measured value (Ye & Wang 2009;Chen, Peng, Yang, Chen, & Ou-Yang 2011), and it can't fit the response data of photosynthesis rate decrease with the increase of light intensity after light saturation point (Evans et al, 1993;Yu, Zhang, Liu & Shi, 2004).…”

Section: Discussionmentioning

confidence: 99%

“…It allows to determine the main photosynthetic parameters, such as light saturation point (LSP), light-saturated net photosynthetic rate (P Nmax ), light compensation point (LCP), dark respiration rate (RD ), and apparent quantum yield (AQY) can be estimated by drawing light response curves of photosynthesis (Webb, Newton, & Start, 1974;Ye, 2010;Lang, Wang, Zhang, & Zhao, 2013). Thus, the commonly used models include the rectangular hyperbola model (RHM) (Baly, 1935), the nonrectangular hyperbola model (NRHM) (Thornley, 1976), the exponential model (EM) (Bassman & Zwier, 1991), and the modified rectangular hyperbola model (MRHM) (Ye, 2007), all of which have certain advantages and disadvantages (Duan & Zhang, 2009;Lang et al, 2013). Researchers have applied these models for pamiricus bean (Wang, Yang, Du, Hu, Zhao, & Mao, 2009), tobacco (Zhong, Zhang, Hu, & Zhu, 2012), winter wheat , zizyphus jujube (Xia, Zhang, Wang, & Zhang, 2014), armeniaca sibirica (Wu, Zhang, Pei, Xu, & Fang, 2013) and other kinds of plant photosynthesis light response curve fitting, and achieved good results.…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic model for citrus cultivar Huangguogan

Liao

Ronga

Qiua

et al. 2020

SCA

Grafting is an effective measure to improve the photosynthetic rate of citrus. The light responses of photosynthesis in leaves of two-year old grafted Huangguogan (citrus cultivar Huangguogan), Huanggougan / Trifoliate (HG/PT), Huanggougan / Tangerine (HG/CR), and Huanggougan / Ziyang Xiangcheng (HG/CJ) were studied using the LI-COR 6400 portable photosynthesis system. Lightresponse curves and photosynthetic parameters were analyzed and fitted using the rectangular hyperbola model (RHM), the exponential model (EM), the non rectangular hyperbola model (NRHM), and the modified rectangular hyperbola model (MRHM). The results showed that: (1) Grafting can change the photosynthetic characteristics of Huangguogan, and the value of photosynthesis rate of HG/CJ is the greatest; (2) The light-response curves of net photosynthetic rate (PN), the light compensation point (LCP), and the dark respiration rate (RD) were well fitted using the above four models. The modified rectangular hyperbola was the best model in fitting the data; the nonrectangular hyperbola model was the second, and the rectangular hyperbola model was the poorest one.

Sexually dimorphic expression and regulatory sequence of dnali1 in the olive flounder Paralichthys olivaceus

et al. 2021

Dynein axonemal light intermediate chain 1 (dnali1) is an important part of axonemal dyneins and plays an important role in the growth and development of animals. However, there is little information about dnali1 in sh. Herein, we cloned dnali1 gene from the genome of olive ounder (Paralichthys olivaceus), a commercially important maricultured sh in China, Japan, and Korea, and analyzed its expression patterns in different gender sh. The DNA sequence of the entire gene contained a 771 bp open reading frame (ORF), two different sizes of 5' untranslated region (5'UTR), and a 1499 bp 3' untranslated region (3'UTR). Two duplicated 922 nt fragments were found in dnali1 mRNA. The rst fragment contained the downstream coding region and the front portion of 3'UTR, and the second fragment was entirely located in 3'UTR. Multiple alignments indicated that the ounder Dnali1 protein contained the putative conserved domain. Its expression showed sexually dimorphic with predominant expression in the ounder testis, and lower expression in other tissues. The gene with the larger 5'UTR was speci cally expressed in the testis. The highest expression level in the testis was detected at stages and . Transient expression analysis showed that the 922 bp repeated sequence 3'UTR of dnali1 down-regulated the expression of GFP at the early stage in zebra sh. The results implied that dnali1 might play an important role in ounder testis, especially in the period of spermatogenesis, and the 5'UTR and the repetitive sequences in 3'UTR might contain some special regulatory elements for the cilia.