Kopšanas ciršu ietekmes modeļu izstrāde. Tā kā pašreizējā pētījumu stadijā ir tikai uzmērīti parauglaukumi pirms cirtes un tūlīt pēc kopšanas cirtes, iegūtie dati izmantoti, lai precizētu Dg izmaiņas dažādu cirtes pakāpju ietekmē atkarībā no valdošās sugas. Iegūtā informācija izmantojama augšanas gaitas simulatoru pilnveidē. Ieteikts sistēmā iekļauto parametru NG, kas nosaka, izcērtamo koku skaita un šķērslaukuma attiecību aizstāt ar vienādojumu, kur tā lielumu nosaka kopšanas pakāpe. Kopšanas ietekme uz saglabāto koku dimensiju pieaugumu, koku skaita izmaiņām tiks gūta attiecīgi pārmērot parauglaukumus pēc 5 un 10 gadiem. Study commissioned by JSC "LATVIAN STATE FORESTS". Title “Improvement of the growth models”. Phase 5 report. Article NO.: 5-5.9_00uy_101_15_284 Lead Time: 01.02.2016. - 02.11.2020. Performer: Latvian State Forest Research Institute "Silava". Research project leader: X. Xxxxx. The other main performers: X. Xxxxxxx, X. Xxxxxxxx, X.Xxxxxx, X. Xxxxx, X. Xxxxxxx. From NFI database were selected 5077 sample plots remeasured in the 2nd and 3rd NFI cycle, as well as 1021 re-measured NFI plots form 4th NFI cycle and recorded to MS Excel. The initial plot selection criteria are: 1) in all NFI measurement cycles sampling plot is not divided into sectors, which means that whole sampling plot is within limits of the one stand; 2) in all NFI cycles the land category is forest stand (code 10), destructed stand (11), burning (12), windfall (13), glade (14) or forest in agricultural land (62). In previous phases, a number of different equations published in scientific literature have been examined. In agreement with the representatives of the LVM, it was decided that new equations were not examined within the scope of this study, but merely specified the coefficients for the equations that were best statistical in the first years of the study (2017). Gradually obtaining information on plots measured in the 3rd NFI cycle, the coefficients on a larger plot database are specified each year. 2019 estimates have already been made using the entire 5-year third cycle database. The average height, average DBH and basal area growth models for a separate forest element developed based. A statistical assessment of equations has been carried out annually. Using the data for first year of cycle 4 plots, the calculations have been carried out separately for during the inter-inventory period thinned and unthinned NFI plots. A statistical evaluation of equations has been carried out. According to the system of...
Kopšanas ciršu ietekmes modeļu izstrāde. KKC normatīvais ietvars